I didn't realize Flight Control was multiplayer and Dinosmash looks great!
Best online game ever (Dinosmash), no sarcasm. It's honestly my favorite game of all time out of every game I've played on any device/console. The online stats says that I have over 600 hours in total since I bought I bought the game in April 2009. Definitely awesome stuff. There's a learning curve to it though. Also, there's no way to make a private game sadly. You can only join the default rooms, but there'a good number of them. I'd start off playing deathmatch mode. But yeah, just know that people might interrupt your game and most likely will. It's awesome though.
You should try Disc Drivin' as well. I've been pretty hooked on it recently. It supports multiplayer up to four players.