Not too many cartoons that I hated per se, but...
MUPPET BABIES--I can't stand the way the characters' voices sounded, and the whole idea of baby-fying the Muppets (who I always dug on SESAME STREET and the original MUPPET SHOW) sucked, IMHO. What would have been so wrong with making a cartoon featuring the Muppets as adults (like they were on THE MUPPET SHOW)?
THE CHIPMUNKS, after the "Chippettes" were added.
PEACE!