Though I initially liked Vindictus, it ends up requiring a grind of the exact same dungeons way too much by about level 30 or so, and it only gets worse from there (grind-wise, that is). The actual gameplay is quite fun though.
Nexon's come out with another 3d brawler RPG in that vein recently, Dragon Nest, which is more toony in art style and involves more fantastical combos and magic and the like compared to Vindictus' relatively more down-to-earth combat. Makes repeating dungeons a little less boring when you can try to raise your performance rank in the dungeon by landing longer combos and not getting hit. (I think my record so far is ~249 hits in Arcane Laboratory on Abyss mode using an acrobat.) Downside? Since it's so new the level cap is still pretty low (24) and there isn't a whole lot to do other than grind for materials for gear once you hit the level cap. Worse, the population is low and that dungeon is nigh-impossible to do solo at level 24 unless you've already got pretty much the best possible gear (and are awesome). Still, it's an option, and fun while it lasts. Seems to require less 'puter power than Vindictus as well, due to being much less graphics-intensive, and the lag when doing dungeons with other players seemed much lower to me (though that might be because I play on the East server in Vindictus despite being on the west coast >.>).