I don't really hate any of the Belmonts, but for the least liked I guess it would be Julius. Old guy's a bit of a slow whipper compared to the other Belmonts (though not so much in AoS. And I'm counting based on how long it takes for the whip to snap forward, not the total length of the animation), and the only notable move he has is Omnia Vanitas (which only saw use in AoS and HD), which isn't really all that useful compared to, say, Richter's tackle.