Maybe I beat you too.
First, I knew and played Gears for the story, so this is a very important thing for me. I played MP for the achievements, but after I played a lot and got better pvp player, I like it (not at the level of being only a pvp player, but to enjoy it (only until Gears 3)).
When I knew Gears, Gears 2 was the last game, so I played Gears 1 campaign, after that Gears 2 campaign and 1 week of MP (Most of the time was playing horde). After that I decided to go back to Gears 1 and finish MP achievements.
Gears 1: My first real 3rd person shooter MP (I played Goldeneye and Jet Force Gemini, my only shooters). Campaign was great, fighting against enemies that can appear everywhere from below, E-holes were a good idea. Enemies were interesting and Anthony was my character for MP. Some parts of the campaign were too dark and I couldn’t see anything (still have this problem).
PvP was me vs the loyal players that played Gears 1. I spend many months trying to finish the achievements playing against better players than me. So (later than sooner) I started to get better in the game. Gnasher duels and going for Torque/Longshot was a fight in this own (against my team and enemy team, after that running away and try to find a good spot to try to kill someone) War Machine, Fuel Depot and Mansion were the maps that I played most).
Gears 2: My favorite Gears. You know about Myrrah, you have Ben (he was newbie and did more things than Anthony, so I feel that Ben was like me: Newbie in terms of PvP), many great maps, DLC campaign, and many DLC maps.
Campaign was a blast, knowing about the Sires, about Adam Fenix and how everything was going worse (and the trailer, one of the best).
Horde… I loved horde, I played a LOT, I played alone and with randoms most of the time. PvP was fun too (How much time I lost waiting for Submission matches…
)
KotH and Guardian were the most played mode
Gears 3: Campaign was really good, especially Anvil Gate. Myrrah in battle armor and the Tempest. Lambent enemies were interesting, knowing Griffin and participating in Save Carmine campaign.
First Gears to put female characters on versus, so I had to stop using Ben (Sorry Ben) and use Sam. Many players used Anya, but I’m not blonde so Sam was my choice.
MP was fun, even TDM (I trembled when I was Last Man Out), but Horde was my main again. Trenches, Checkout, Overpass and many others good maps (I don’t remember bad maps on this Gears).
Beast mode was interesting, but if horde can be a bad experience playing with randoms, Beast was worse.
DLC Campaign, even when you know that some characters cannot die was a blast too.
Gears Judgment: I like it, not at the same level of the other Gears. What I missed was horde. Not much to say, except that I liked that map were you can be on the rooftops and going to the streets without using the stairs.
Gears UE: Improved graphics, the same good experience again.
MP: This was the first time that I had problems finding matches. I didn’t find any matches for a month.
Gears 4: What I hate (and still hate it) was windflares. I though that Marcus had died, and when he breaths again was a relief. Knowing that juvies come from humans was weird, but OK. Fighting against robots… Well, for a time was OK too.
Kait with the medallion at the end was WTF and many theories came and gone.
MP: When I knew about max re-up, I tried to reach that but I just got bored at Re-up 11 IIRC, Dodgeball was a nice addition, but more players were toxic and I got a lot of bad messages when I was Last Man Out and lose. After ping update I didn’t find matches, never. Not even in Quickplay. I wrote here in the forums, I submitted tickets and never got an answer. That killed my motivation to keep playing for fun (I played only for challenges/skins and achievements).
Horde: I understand that many players like classes (I like it too, to some point), but I lose my best partner to play horde. He played casual (what I mean is that he just needed to pick up a longshot, gnasher and just play), but no start to level up cards, choose cards needed for that (I don’t remember that Sniper class had some buffs for using Gnasher) and most important, I feel that you need Engi ln Gears 4 to finish horde on highest difficulty. I didn’t like engi, I played as soldier. So I just went on my own, with more randoms and Engies that built too much sentries or didn’t know what to build.
Achievements: This was the first Gears that I found achievements more as a chore than something to unlock while playing for fun. How many times I had to play campaign… And that glitched Inmortal Snatcher while you were on Ironman… 
Seriously were always grinding, but at the end I was playing for fun while trying to unlocked it (Gears 1 is a mix because that I was newbie but when I did something amazing was really good)
Not my best experience for Versus overall.
Gears 5: Campaign was… Interesting? Going to New hope again was good, I am not a fan of the open world but I don’t find it a fail or worse idea ever. Choosing who lives the first time filled me with anxiety.
The best thing in campaign is Lizzie. Finally a female playable Carmine, and her arms remind me of my arms, so I had to say goodbye to Sam and I use Lizzie on everything (Believe me if Jack have a skin of Lizzie’s helmet, I will use it). Or a flying Lizzie’s helmet.
MP: Now I found more toxic players than ever (At least at the start, now I didn’t play too much PvP, only for event/skins/medals). Horde was good, more classes means more ways to play (I play mostly Jack or Combat Medic).
Escape: The best thing if you have a team, but I feel accomplished if I was able to finish a hive on masters with randoms (with bad randoms. I played with many good players who at the end carry me and the other player).
Campaign DLC was really good. I like to know how Hoffman started the idea and how to get implemented.
Even if I don’t have the problem of not finding ranked (competitive) matches, I still feel sad for the other players who can’t find matches. The same problem since Gears UE, and still no answers from TC.
Achievements: More grinding achievements. Still waiting for news if the new achievements for op 8 will be retroactive or not. Even when I want to play horde to finish some maps from 1 to 50, I’m trying to delay it playing Gears 2 JP and UE on Win 10.
Not the best Gears, but not the worst.
I still like the franchise, but I hope that when Gears 6 is released, it will be the end of this new trilogy and please leave Gears rest for many years. Maybe Tactics 2 or similar.