People like Charizard because he is one of the few pokemon based exclusively on dragons. And we only have a handful of those: Charizard, Gyarados, Dragonite, Salamence, Rayquaza.
Notice something? All of those pokemon except for the one that looks like a plushie are extremely popular. If Gen 6 were to introduce another fire-breathing dragon (Reshiram is has a turbine for a tail, is partially based on Ahura Mazda, and has some fox-like traits as well, thats not exclusive), you can bet that it would be popular.
Now that said, if released in Gen 5, Charizard would lose his nostalgic and Anime appeals.
Not changing this sig until we get a new main series Tales game released on a Nintendo console in the US
Not really because if it was introduced in Gen V like TC said
No, not all Gen V Pokemon are automatically hated on by anyone but Genwunners. The only thing that gets hated on are the starters, and Charizard would be more popular than the Tepig line at least.
That wasn't my point though. I was responding to people saying that Charizard would more be loved than it is now because it would have a unique typing, which wouldn't be the case. I'm not agreeing that Charizard would be hated, but I do think he would significantly less popular if it was introduced in Gen V or was never heavily used in the Kanto, OI and Johto anime.