No, the music wasnt particularly a problem I had, and if anything its biggest crime is reusing music from MoF. That felt really lazy, no matter how much they re-orchestrated it. the music did overall feels I dunno, more lacking than LoS1.
Part of me thinks the music was originally composed for LoS2 and that it got "bumped down", so to speak, for early use in Mirror of Fate. Not that it really matters, but given the overall difference in quality between the LoS2 tracks and the MoF tracks, I find it to be more likely. MoF's soundtrack was pretty phoned in outside of a couple of tracks.
Ahh, well, what should LoS2 had more of? Well, more castle, and more Victor, and more ending. Honestly, LoS2 is one of those games I feel needed LESS of bad things, more than it more of good things. IMO, when it was good, it was great, like the castle and the combat, but then it got slogged down in so much bad. Take those things out and the good things would have filled their place if designed correctly. But I guess its all about perspective whether you need more of something or less of something else.
For example, it needed more pre-apocalypse. If I'm going to play in a future setting, I want to play Dracula dealing with being 1000 years displaced, but you don't, because that world goes to shit in the first 15 minutes of the game. So there was no stalking commoners, no sneaking around rooftops, no ambushing people in back alleys, just rat stealth through well-maintained hi-tech facilities to avoid un-killable guards, and battles against steam-punk police on the rooftops. The fact that the "end of days" countdown started at the very beginning of the game killed a lot of tension. The game needed a traditional buildup where you go through the city, get familiar with it and how it works, then in the late-second act everything goes to shit, and you actually feel it because you knew the city before it went up in flames. There's real impact there. You feel the threat.
Instead of that we got this back-and-forth hi-tension, low-tension deal. One second demons are invading Castlevania city, and the next second Dracula is chit-chatting with Trevor. One second you have this great scene with Marie and this great boss battle with Carmilla, but then all the build up is thrown away and you're just roaming around a burnt out city again and Marie is never again to be seen. I'm supposed to feel threatened by Satan, but I don't, because nothing ever gets worse. It just stays at a "Hey, everything is kind of bad" tension level for the whole game, unless you're roaming around the Castle which, while the best parts of the game, actually killed any sense of tension. They want to tell two different stories, and they both suffer for it.
The game also needed more of a sense of power. They gave you some cool powers, like possession and transformation, but you never get to do anything cool with them. Ok, I'm Dracula and I get to posses things, but only if I can sneak up on them and only for a limited amount of time, and I don't get to do anything cool with them? Lame. And while getting pwned by Golgoth guards is fine when I'm weak, but when I'm strong let me turn the tables. Let me feel powerful! Power isn't about getting railroaded through a very specific set of steps, with minimal opportunity for mistakes, its about freedom. If I'm going to jump into a Golgoth Guard, I want to bazooka the shit out of people with him. Hell, Mercurysteam should have preemptively taken a page from Shadow of Mordor's book. I'm Lord Dracula. Let me dominate and command monsters for. You don't need to let me do it to all of them, to maintain the challenge, but give me an ability where I can temporarily restore my own army in battle. That would be awesome.
I also didn't need this bizarre dimensional plot to visit the castle. Some supernatural force raising up Dracula's Castle, a castle which he then has to go and reclaim to wield against Satan (if Satan HAS to be in the game), would have been a far better situation than the nebulous Dracula blood that's kind of your enemy but kind of not leaking into the real world maybe once? I dunno, it didn't make a lot of sense. So LoS2 needed more sense.
Also, more consequences! This goes back to the tension thing, but when I beat Inner Dracula, it meant nothing. There was no sign, gameplay or plotwise, that anything changed, at least not in any significant extent. Like, I conquered my Inner Evil and got wings? Woohoo... Same thing happened when Victor died. For being the last Belmont, his death meant absolutely nothing, and it did absolutely nothing. And all the fetch quests, like for the Mirror, ultimately amounted to nothing. Really you spent 20 hours doing a whole lot of nothing.
Finally, more Satan. If you're going to bring back the Prince of Lies, make the fight even more spectacular then the last! Like 4 phases of evil. Start with the dumb whale, then the Alucard fight, then a Satan fight, then a SUPER Satan fight, and then top it all of with a weakened Dracula against a Belmont, or a redeemed Gabriel against his own inner darkness. THAT would have been sick.