Fun at first...
Sure, the game has great graphics and animations, not to mention cool powers and buildings and stuff, but then again, what's so fun about flying if you're going to end up having to take some sort of public transportation everywhere anyways? Yea, that's right. You have to take the public transportation EVERYWHERE you go. Unless you feel like having to fly to the little door of admittance to the next city and then to the next and the next in order to get to wherever you wanna go, which takes forever. It truly takes the whole fun out of it. The battles are fun, but then they get repetitive, and with repetitive battles and boredom later, comes the boredom of the game. I used to love this game, but then I realized how little there was to do and just stopped playing it.
The PvP system is really crappy, since you can only do PvP in like 4 designated areas, and it's just a bunch of people in basically a moshpit killing each other. It's really stupid.
So if you're considering buying this game, my suggestion is to have as much fun as you can with it until you realize how boring it is. You'll get a good 40-200 hours on it at least.