No, I don't think he's slow, but his attacks come with the price of high windup and finishing lag. He gets kudos for his crazy bike, his recovery, and his unpredictable movement. I'll have to admit that Wario is looking better every day with some players, so I guess I stand corrected on the Wario part.
Peach is worse than Ivysaur. She is outranged constantly, her recovery keeps her totally open to attack (an Ivy fair), and she really can't do much about projectiles except throw a turnip, which everyone can catch anyway. At least Ivysaur can cancel most projectiles with her jab.
Jiggz, seriously? If an Ivysaur is using f-smash or fair, there is absolutely nothing Jiggz can do to outrange it. As for the recovery gimping, Ivysaur just uses one razor leaf early, causing Jiggz to cancel it with pound early, allowing Ivy to tether safely. Rest got nerfed pretty badly, sorry to say. I used to like Jiggz, but this is not Melee's Jigglypuff, please deal with it.