I would try Wonderking. Maaybe GrandChase. GrandChase is boring IMO.
Wonderking is actually pretty fun. Some call it a MapleStory clone but I see it as better. I don't play much at all but there is an IGN forum so check that out.
i 2nd brightshadow. And your in luck, cause on feb 8th they have an ep 1 updates =]
but if your a casual gamer, go and try grand chase. Its an arcade style. I mainly play that since you can just log on and kill 2 hours and take a break then log back on again and still be as fun =]