I absolutely love Buizel. I have no idea where the hate may come from. I guess in some communities (like that thug-place that calls itself DA) Buizel is a pretty overused character because he's just so freaking adorable, which kind of puts him in the group of other pokémon deemed to have "too many fanboys" (Along with Dragonite, Lucario, Pikachu, Umbreon, Charizard, etcetera) and must thus be despised because it's so overrated and it has way too many fans, and even though a lot of people like it, they do not and they think their opinion has more value than theirs, and they're clogging up the internet with their buizelness and all of that kind of obscure hipsteristic...genwunner...stuff. That's literally the only reason I could possibly imagine anyone hating Buizel.
Buizel is among (Slowbro's cuter and sillier) the awesomest water pokémon I know. They're super cute and all and they have such an upbeat appearance. And still have a cool nonchalant expression most of the time.