I agree with Puwexil, there was just not enough care into the port. As such, it suffers from the usual 'port' problems (slowdown, extra loading, unusual resolution/stretching), and the new content can barely make up for these problems (if at all, but that's up to the player).
I love the way Maria's moveset is, but I'm not fond of how short her jump is (although she does have three jumps).
I do like the tunes added, plus they finally loop correctly (as opposed to SotN PSX's 'stop-loading' silence before the loops).
Richter's new outfit needed a lot of work. Hell, I could've come up with something better. I'd be willing to make a new set right over that set that's proper, just to play the game with a fancier-looking sprite job (with some hacking tool).
The new areas are a nice touch, but they did need their own tiles. They're totally Frankenstein'd from other areas.
Alucard's Spear looks pretty neat, considering it's the only 'spear' weapon Alucard can use.
Also, you get to hear Nocturne!