actually Olaf is a good idea and he was great for the movie, they should have just picked a slower and less annoying voice for him.
In himself, he is a fitting character and is cute.
I wanted to get the Olaf waffle maker when they were out, because he is very cool.
Same thing happened in the penguins movie, great characters, cute as all get out....but the voices selected for them, MEGA FAIL. I would bet that is the main reason the movie didn't do very good. They should have cast the voices to better voices and maybe even well known stars. The way they did it, dragged the movie down.