I started playing vindictus a little while ago and it's pretty fun. I'm on west server and it seems pretty active. There's a full guild system, plenty of instance dungeons and some epic boss fights to be found.
Not to mention 4 rather unique character classes to choose from. There's Lann, Fiona, Evie, and Karok.
Lann is a kind of dps character, he uses either twin swords or twin spears. I dont know much, but from what i've seen he gets a pretty cool spin move that slices up everything around him. Haven't played him though, so it's just an observation. :P
Fiona is a tank of sorts, with shield and sword/hammer. The hammer has some pretty epic moves too, right now I'm playing this one the most and she can hurl enemies with her hammer across the map xP
Evie is a mage, but also a healer, she can heal, revive, and eventually swap out her regular mage/priestly spells for some awesome looking Scythe moves, all of which hit really hard and have excellent range.
Karok uses an enormous pillar, this dude is like an engine of destruction. When he swings that thing around just about everything dies, he can even grapple with bosses and punch their lights out. Epic.