I didn't mind Peeta that much. Sure, he has Sue-ish qualities, but I think he's completely overshadowed by the Sueness of Prim. Good god. Absolutely everyone nation-wide adores her, she's pretty (the more noble kind of pretty in this universe, not like Katniss or her father), she's a competent "born" healer, she's nice to everyone, she cares about all living things, and her main flaws are... being too compassionate (and that's Katniss speaking, who's rather cynical) and not being a person who could/would survive the hunger games, and not being a good hunter. Katniss mentioned that she gets scared easily, but this is contradicted by her rather brave actions in book 3, for example. And yes, this could count as character development, if only Prim had been a well-developed character to begin with. All we know about Prim is mainly from Katniss's gushing about her.

Also, she's named after a flower, but it's an innocent name, unlike Glimmer, or Cashmere, or whatever the people in district 1 and 2 were called.