Meh, I can name all the maps now but honestly the only ones I like are Monte Grappa and Argonne (though Ballroom Blitz is fun). My major problem with operations solo is that no one wants to work toward the goal, everyone is trying to do their own thing. At least with friends you know at least they're working toward the same goal as you. It's still enjoyable but if I'm going to play by myself I'm going to go Domination where I can do what I want, how I want, and still contribute to the team as long as I'm assaulting the flags and not feel like a jackass for not doing what the SL says.
I really do with they'd bring back the ribbon system, god the amount of rank ups you can get from just ribbons is nice. Sadly I don't think they'll bring it back just for that reason (200 xp for a ribbon, 5000 for a medal wouldn't really cut it here). Assignments would be nice but I wouldn't want to go through all that work just for a weapon skin (kind of like how I don't give a rats ass if I get a battlepack anymore, it's not worth it if all I'm going to get is a random skin that I probably already have for a gun I'll probably never use). If they brought it back for weapons I'd be all for it (if it's not god awfully powerful weapons like the Deagle), maybe weapons that were historically correct for the time but very rare on the battlefield.