Why do people start threads like this with sweeping generalizations?
Personally, I love losers like Electro. Yes, he's one of the most powerful villains ever, but the fact that he's too dumb to realize it is one of the things I like about him. If Doc Ock got Electro's powers, he'd be fodder for the likes of Thor or the Hulk. But Electro got them and he's a moron, so he gets to stay in Spider-Man's weight class.
If I could revamp one Spidey rogue, it'd probably be Black Tarantula. For a guy with so much build-up and so much power, he turned tail and vanished into the night pretty quickly. Bring him back, make him a credible threat to Spider-Man for more than just Spidey's friend being the mother of his child, and let him loose.