I am and forever will be a huge fan of Golurk, Braviary, Victini, and Chandelure. They're easily my favorite Unova Pokemon, although it took a bit to warm up to Chandelure. I also like Zekrom's design, especially the awesome blue glow ( :D ). Samurott is epic and is what decided my starter choice. Cofagrigas is better than I thought and has really grown on me since I first retched at its design (now the face cracks me up). Lillipup is adorable and Herdier and Stoutland are pretty cool. I also love Zoroark, especially with the strategy in its ability.
On the other hand, Garbodor, Kyurem, and Cryogonal are downright ugly, I hate Watchog's color (the design is fine, but the color.... BLEH), and Sigilyph is just...weird. Sewaddle may be cute, but Swadloon and Leavanny are unappealing. Druddigon is so close to looking cool, but the head just ruins it, and its stats are pretty bad (especially compared to other dragons like the awesome Haxorus or Hydreigon). To be honest, when the first Pokemon started showing up on Serebii, I thought this list of hated Pokes would be longer, but...they've really grown on me.