Everyone's saying try it out and whatnot, but really, Grand Chase isn't a game that you can play for extended periods of time without starting to hate it. I personally play casually and don't obsess over rare items or winning PvP.
It really really helps if you can find a group of people to play with so you hate the game less as time goes on (like joining a guild!). Grand Chase tries hard, and it's alright, but it's difficult to stay with the game unless you have an endless pool of patience.
Yeah, I'm so biased.