I really like all of the previous-gen-extra-evolutions that Gen IV brought around. All of them dramatically improved on either generic/good Pokemon and made them even better. Critters like Rhyperior and Magnezone, to even something like Lickilicky, which shouldn't work at all, but strangely does. And the Sinnoh starters were collectively my favourite group of them. Even Torterra wasn't horrible, which is what I normally think of Grass starters. As for the rest of the Sinnoh critters, the only real complaint I'd have about them was that - like Gen V - there were too many legendaries. But as far as the designs/movesets/names etc. went, I really liked them as a whole.