When i do the melee it basically pauses after the hit since you cant do the execute move on them, which is the best way to deal with those types of enemies
When I have ultimate i can just rapid fire melee but non ultimate melee is strange to me against non executable enemies
Melee and dodge is pretty much what I do against these.
I am assuming you mean Scions, pouncers and sires. So yeah, pretty much melee and dodge and let bleed do its job.
Roll back or to the side or do a wall slide after the first or second hit, preferably before the enemy melees back to avoid the stagger and/or damage.
And for tougher enemies like Scions or DR-1s you’ll want to flash them(or stun them with an EMBAR) and/or hit them with a Breaker Mace for a faster and easier kill.
Hit and run. Let the bleed do its job. Also, use flashbangs if you have them.
Avoid Ice Scions at all costs.
Ice Scions can ghost freeze you even when they are stunned.
Theres a melee combo system in Gears 5 if you’re unaware. Basically you hit melee 3 times in succession and it’ll will do a melee combo for 3 quick hits.
For Boomshot and Ice Scions I recommend using flashbangs on them and then killing them with a mace. Pretty much any enemy that is bigger than a drone I recommend a mace.
That one is OKAY…but…but…
Palace Guard with the Insta-Freeze Cryo Cannon is much Horrible 
Yeah no, Ice Scions are just as bad with the BS insta freeze.
at least you still have a Second to Roll, but Palace Guard is…“Can I move？”
“He just Freeze me when I have reaction to Roll it 
！！！”
Luring flyers into areas with low arching doorways is a good tactic, you can land some hits before they fly back up.
Also as a side point about the smaller enemies - remember what causes what enemies to stagger. Normal Drones (i.e.: non-elites) can be staggered by the 2nd slash; Deadeyes can be staggered by the 2nd slash; Theron Guards stagger on the 2nd slash; but DeeBee Shepherds; Palace Guards and all Swarm Elite variants only stagger on the kick, so you’ll want to factor this in too. On higher difficulties / waves you don’t necessarily want to get into a punch-fight with the Elites - better to slash them twice and retreat.
Also, all heavy enemies melee with their left arms, so you can actually dance around them by sliding/rolling to your left / their right. Slash once, roll forward-left, turn slash, roll forward-left etc etc and you can avoid their attacks. Not advisable when there’s other enemies around shooting at you, but if you can isolate a heavy, then you can do this untouched.