Not at all. King Candy radiated "bad guy" from the beginning. The fact he was Turbo was a good twist, but they were telegraphing he was the villain pretty early into his introduction.
Muntz and De la Cruz weren't revealed to be villains until pretty late in the movie
If you compare King Candy being the villain and then being revealed to be turbo to Ernesto De La Cruz being the villain, and then being revealed to have murdered Miguel's actual great great Grandfather, the latter was pulled off much better.