I don't like the two smaller DLC maps (I always use a sniper) Skyshock on the other hand is fun, it's about the only map in the game where you can't just stay fixated on your radar ftw. The only other map would be First light but I haven't been matched into that map for what feels like a month.
I get annoyed at how often combined arms comes up but salvage always gets skipped over. Salvage is the only game mode offered that isnt straight up kill to win and they only offer it for about a weeks worth of time total since the game has come out.