Personally I like Freestyle Street Basketball (FSSB for short) because it is an MMO that heavily requires teamwork (unless you only 1v1). It has 3 different playing styles at the moment, which is 1v1, 2v2, and 3v3. The people running the version i play, gamekiss, announced that 5v5 will be released into this game. This game receives updates every two weeks, which can include items and skills, and they are active in the sites forums.
MMO's are crap to me, either there a bunch of greedy hogs, like Blizzard(WOW) and Artix Entertainment(the people who make Adventure quest, Dragonfable, Mechquest, and AQ worlds all which now suck. Im shure you've seen their ads ... all over the place.) or their Stupid retards like Jagex(Runescape) or ... Artix entertainment. and some both like Artix Entertainment.