Well, I finished entirely the game with all 42 Success in Paladin mode and every kind of achievment. Only 7 days to do that, not really tough.
It's clearly more than any IGA games which can be completed in 1 day the first time play, nearly impossible for this game as it's long and full of things to do (seriously, no cat search in this one or silk to find to make beautiful robes^^).
It was really a great game AND a great Castlevania. We just have to forget anything we know about Castlevania playing it. I missed the Axe, however, and some traditional weapons that weren't hard to add in the product.
Music is awesome, graphics too, plot I don't care at all, general ambiance was impressive, even in forest/jungles or snowly village which aren't very well known Levels for all Castlevania fans.
The biggest problem, is that we've got 4 years more to wait until playing a new "good" Castlevania. That's hard, and IGA' little creations will not be enough to satisfy us until then.