Back when I was a regular on the Anti-Chapel forums, I championed the idea of "filler episode games" wherein fan favorite Belmonts like Simon hunted down Dracula's worshipers and top lieutenants, but Dracula himself did not directly appear in the game. It made good sense to me that most of a Belmont's life would be spent dealing with threats other than Dracula himself, and it would also preserve the impact of Dracula's resurrection, keeping it an "OH SHIT! HE'S AWAKE!" rather than the "Whoops it's 9:45 PM. GUESS WHO'S BACK FROM THE GRAVE GUYS." his resurrections eventually became while still allowing for a regular release of titles.
Dracula is also wasted as a villain. He doesn't do anything, usually, just kind of sitting around and waiting for the Belmont to come along and kill him. Rondo of Blood and the N64 games are the only games to really have him involved in the story (in the latter case via Malus, but it counts). We never see good examples of why Dracula is this guy to be feared and dreaded. Mirror of Fate, for all its faults, showed that Gabriel-as-Dracul did deploy his armies, and yes, they did destroy a lot of towns and lives. Dracula needed to be used more effectively as a villain -- as a true antagonist, rather than a gameplay objective. He needed to do evil things, show up regularly to taunt the hero, and generally prove himself a threat, which Rondo of Blood and Mirror of Fate excepting he never really did.
That's one of the reasons I loved Evil Maxim, Walter Bernhard, Zead, and Isaac as villains: they did VILLAIN THINGS. They were antagonists, in the true sense of the word; Zead most insidiously of all by going the full "Corrupting Darth Sidious" route.
The sad truth is that, even when he IS present, Dracula is less of an antagonist than his servants. Death has been fairly involved in several stories, Carmilla was the real antagonist of Circle of the Moon, and Gilles de Rais made for a more effective Dracula in CV64 than Dracula himself usually does. Castlevania has a lot of great villains, but Dracula is only extremely rarely one of them.