The soundtrack is superb in my opinion, it's been my default background chillout music since the demo rip was put out. The ost for MoF's bene in my car permanently for months, and is about to get replaced by the ost for 2.
Another thing in LoS's favour is the stellar voice acting, particularly from Rpbert Carlyle. *That* scene in MoF gets me every time. I didn't expect to love him as Drac, but he grew on me very quickly. They gave him a very real reason to be so full of hate, with the personal tragedy of his family, especially him, Marie and Alucard being spot on. Alucard's reimaging was also very badass. I loved the fact that while they paid a lot of homage to Ayami Kojima's depiction of Al, at the same time they made him very distinctly different but equally as cool. (I really want his coat!) I would be very happy to see more of Gabe and this Al, especially Al, considering how much he's been up to off-screen.
I would love to see the art direction and graphics quality from 2, as seen so well in the castle sections, applied to a more traditional, full castle. MoF had this, but it was far too short imo, and I wasn't amazingly keen on the art style for it, especially in the cutscenes.