I will be somewhat serious now.
I never played Gears MP. Really I still find third person a bit clunky for a "shooter" but I suppose in a lot of ways it isn't a big deal. Needs a bit better FOV though, I don't like having half the screen becoming a blindspot.
Team vs Team makes sense to me if you want to add some sort of pvp for a Mass Effect game. Then again I never cared for "deathmatch" style MP. That was part of why I liked the original Counter Strike way back in the day. You can practically do the same thing with ME though. C-Sec vs Blood Pack. Or STG vs Eclipse. Whatever.
So I guess I wouldn't care if there is a deathmatch mode, I just wouldn't be interested in playing it. Team vs Team could be cool, as would real cooperative missions. The latter seems like it would have made the most sense for a Mass Effect game, but we didn't get it. I guess because it was the first attempt.