Not many people could do such a good job of playing television's most cynical and jaded cartoon horse. Will Arnett is perfection as Bojack Horseman, a character we manage to like, despite all of his extremely unlikeable characteristics. If that's not great acting, we don't know what is. Of course, Arnett is actually more famous for his onscreen roles, but he has done a fair bit of voice work, too.
He has also lent his voice to animated films Ratatouille, Monsters Vs. Aliens, Despicable Me, and The Batman Lego Movie. Those who aren't much into cartoons or animated films of any kind will know his television work as Gob Bluth from Arrested Development or Devon Banks on 30 Rock. As for film, he has starred in Blades of Glory, Hot Rod, and Teenage Mutant Ninja Turtles.