Stoutland and Sawsbuck are good in OU under certain weather, but are NU. Yet, they're never as hated as much by the likes of Smogon, who tend to crap on Charizard all the time. Charizard is very powerful under the sun, able to OHKO an Arceus. I think he gets all the hate because he's an original starter.
You realise it's gamefaqs posters that hate Charizard, not Smogon, right?
Smogon has refused to rank Charizard in their Viability rankings even though it's a powerful sun sweeper given the right support. And not a Usage Stats topic goes by without someone mentioning how mad they are that Charizard is being used.