I got the most play out of gears in months during BTTE with a friend for the very reasons Breakbeat mentioned.
Also I find 2v2 easier to coordinate and play tactically because unless you are lucky enough to have 4 friends that play well as a team and attack opponents in a well executed chess like game then 2v2 will always come out on top tactics wise for me. Deathmatch is great for a pic up and play experience but you often have low kill teammates that rush in and let the team down. 2v2 is far more coordinated and you know you only have yourself to blame when you loose.
Also camaraderie and communication wise BTTE beats TDM hands down. The few games I had with randoms when my teammate was offline on my BTTE team asked to form a party and we’re ready to play as a team and make new alliances. Much better socially than TDM.
So please make Brothers To The End a permanent play list for your loyal fans!!!