Well, pardon me if I was too busy laughing at the anecdotes provided by Misty's attitude more than the clothes she was wearing.
Due to the lack of anecdotes provided by May and Dawn, there's little else to pay attention to (In Dawn's case, that phrase can mean more than one thing. >.>)
Let's examine this further.
In the case of May, she had little fans to start with. People like myself were disappointed with the departure of Misty (and in my case, I was further disappointed by the departure of Togetic in Misty's return in Hoenn. I mean, TRY and put our hopes up...please?), so we weren't feeling the tight leather mess that was May. She sort of grew on you, but the lack of quality in her catches versus the animocity towards her replacing the show's best female character made her hard for me to really be a fan of. Then, in the Battle Frontier arc, just as her team began to become more potent, her personality took a nosedive. The idea of her and Drew was stupid. I mean, sure, it was obvious from day 1, but at the same time, did she HAVE to have a love scene at pretty much every meeting they had? It ruined what little respect I had for her, for me at least.
In the case of Dawn, it's all about her team. Piplup's "I'm that cool kid, and you'll listen to me" 10 year-old attitude pisses me off, as dealing with those people is the biggest headache I've ever faced. Being reminded of that makes my temples ache. The rest of her Pokemon are annoying, barring Ambipom, who should have stayed with Ash, IMO, as Buizel was annoying. Buneary is a floozy, trying to get with Pikachu. Pachirisu, I have no respect for, being Pikachu's...4th wannabe? I lost count. And knowing what I know, I'm STILL pessimistic. As well, Dawn's ATTEMPTS at anecdotes are about as funny as the logic behind how Team Rocket gets the budget for the robots and mechanisms it uses to utterly fail. The concept is the same; it's dry, pointless, makes no sense to be there in the first place, and utterly fails.
Both are insufferable floozies for YxZ fanfics and serve no purpose other than to attempt to come up to the unmatchable plateau that is Misty. I mean, sure, their Pokemon did MUCH more than Misty's ever have or will, but at least Misty had so much personality to appreciate that you didn't care how short her skirt was, or how pathetic her team was.
End rant.
