I for one don't think that the whole "Dracula should be evil because 'Evil is CUUL!'" thing would've worked out much better, considering how his backstory had been changed around to the tragic "got his powers by murdering his family", (it's a cliched backstory, but it couldn't just be swiped out for comic "look how fun it is being evil!" supervillain stuff). That said, I don't think he should've been a Wangsty "I'm only driven by the deaths of my loved ones (who I was tricked into killing myself, and rather stupidly at that)" emo either. He should at least have gotten over that within a couple of centuries (maybe he's bitter and cold, but not still constantly blaming himself, or wishing he could've "gone back in time to change everything" and whatnot) and if the "killing the wife and kid" thing WAS meant to torment him, have the wife and kid appear as ghosts, and getting legitimately furious when Dracula goes about his evil behavior, rather than "they're so good they keep trying to rekindle the light inside him" bullshit that makes the family massacre contrived in the first place.
Second, if the point was to knock Dracula all the way down the food chain, you should have him climb back UP the food chain, and drawing the forces of darkness to his side, rather than just be a one-man army with the standard holy powers being swapped out for dark powers. It'd be kind of like the minion mechanic Yahtzee mentioned, with certain incremental levels: first would be the boot-licking goblins and imps, (who join either because Dracula threatened to rip them apart, or because he's nicer (or at least too busy to actively beat them up)), then would be the more mid-ranking vampires and demons (who begin to respect his genuine leadership), and finally taming boss-level monsters that can REALLY rip apart groups of bad guys, or help go toe-to-toe with even bigger bosses (imagine a fight against a giant dragon with Dracula flying on another dragon that Dracula himself tamed in an earlier boss-fight.
And if the point was "the man before becoming Dracula redeems himself by using Dracula's powers for good", than have him USE those powers to their greatest extent at the end, such as being able to completely obliterate the "these guys are way too fucking big, you're gonna have to sneak around him" lunkheads, at least near the end of the second act. I frankly don't care if it ended up with resorting to a Bayonetta/Asura's Wrath "use the QTE's for REALLY over the top attacks/executions", as long as the end result looked like something only "The Prince of Darkness" could pull off.
The end goal shouldn't have been "kill Satan to end evil" either, or if it was, it shouldn't have magically restored the modern world back to normal. Killing Satan would either leave the human survivors to fight each other in the ruined remains of their civilizations, and/or lead to a power struggle in the Underworld for Satan's position, forcing Dracula to begin leading a dark army to contain some of the more destructive human enclaves and demonic warlords. That'd at least be enough to make Dracula "good" in a Punisher anti-hero sense, by using dark powers to stop even more evil forces from running wild, all without having to whine and ***** every other minute about it.