I bought Castlevania and Enslaved yesterday. Originally, I thought Enslaved would hands down beat Castlevania.
But after playing both I must admit that Castlevania is the better and deeper game so far. Both are great. But, if you like God of War games this is the best clone I have seen to date. Its settings are beautiful, the combat is impressive, and the game itself is epic (The only issue is in some of the platforming, but just be aware and careful of it, and the game is perfect).
Castlevania > Dante's Inferno > Darksiders
Enslaved is also a really good game. They solved the age old platforming issue of accidentally jumping off a cliff and resetting you to a check point you don't think you should be at... I can't remember how many times I played a game like Tomb Raider, Uncharted, Darksiders, Dante's Inferno, Prince of Persia, etc. and thought, "Great game, too bad that when I move my stick slightly wrong on a cliff side, I end up plumetting to my death and reset at a 3 minute ago checkpoint just to do it all over again for the next 15-20 minutes until I figure out the exact right move to save me!"