I personally don't hate Emboar, I think he's pretty powerful looking. I don't like Pignite, he looks fat and stupid to me. But Emboar's ok. It's more a case of wasted potential than genuine dislike, for me at least. The Fire/Fighting thing is irritating but not the end of the world since ignoring the repetition it's a pretty good combo.
I personally think the Gen V starters are comfortably the worst so far though. I like Tepig but don't like Snivy or Oshawott; personally I think the only one of the three who gets significantly better throughout the evolution chain is Samurott, although he's a bit left-field (not necessarily a bad thing). For me: