Good Animation is a plus. It if has a good art style that I enjoy, I'll watch it, like I did with Chowder, Spongebob, SSM, and Flapjack. But however the writing has to be equally as good, if not better, if not, I won't watch it, like the second season of Chowder has been in that department.
After all, if you have all fluid and bouncy animation and no story coherent story, you mostly end up with a mess.