Except for the lag. On good days, my brother and I could duo Decisive Battle on hard mode with Season of Macha option on. Usually, though, one of us is rubberbanding and teleporting all over the map. We're both using cable internet and just couldn't understand why it's so bad. Solo running the instance is smooth sailing, but anytime we team up in a party it gets real laggy.
It's beta, and I like the game, but I hope they fix the lag.
As for the gameplay, I'm told it's similar to Monster Hunter (jp only). Though there are only two classes available right now, and only two instances too (with varying objectives and mob spawns). It's a fun short MMO I guess, and can be picked up really fast. The game needs more content, because it can get boring after a while. Still, fun game, since it's action oriented. A good break from the tab+hotkey games.