I only really dislike the evolutions already stated here (Exeggutor, Lickilicky, Dugtrio, Magneton, etc.) but Dragonite is among the best of the evolutions out there. It and Goodra are the most adorable dragons to exist.
Though, I feel Dragonite shoulda just been in a different evo line, Dragonair could have been an acceptable final evolution. It's very majestic.