I'd say, Dry Dock, Black Water Canal, Eden, Exoplanet and oddly enough, Crash Site (I always do very well here since people panic when I set them on fire as Scorch). I think the only map I kinda am not warm to is Boomtown since a lot of times, people just camp inside the structures and matches drag on.
I like maps that offer a good balance between Pilot and Titan combat (I know Crash Site is a contradiction of this, but eh). I can understand why people might not like Crash Site and Complex, but c'mon, people! Don't quit when you see it.
Once you memorize which routes to take and shake up your weapons and Titans, it becomes a breeze. I mostly use Hemlock just for Crash Site with Cloak and I get a ton of kills. Scorch is very good as well since there's a ton of tight spaces.
Quote or tweet the Respawn guys. They're usually quick to ban these asshats. Seriously, I never get why some people cheat in MP games. It's not like they get money or something tangible with it. No one's impressed, and you'll look super pathetic, no?
I just hit Gen2.40 and damn! Will try the R-97 SMG. I kinda hate there's only one happy hour and it doesn't matter if you're a member of multiple Networks. I gather, it will get super abused by some but maybe let us at least get 2-3 games in for double merits? It's a long way to Gen10.
Change Data Centers. Usually gets sorted out. That's what I do.