I can sort of see why people don't like him, but if you hate him because he's whored, like I said before, that's something to hate on the writers, and not the character. But I guess it's something that's hard to ignore.
Why I like Axel?
Because he's one of the few members that was actually nice to Roxas.
Because IMO, Axel (and Riku) is the only KH character that get proper development.
Because he's one of the few, if not, the only member that deserves a heart.
Because his personality is (pretty much) human. He has his share of flaws.
Because pretty much everything about him is hot (even his element).
Because he's like a big brother to Roxas and Xion.
Because he would do anything for his best friend(s).
Because he's sexy and mysterious.
And even if Axel was keeping secrets from Roxas, he was doing it for a reason.
That's why. :I