Plot: It's about an animal with a cat as a head on the left side, and dog on the right side, as a butt or a head, CatDog. CatDog, always encounters mishaps caused by Dog, and sometimes, just plain mishaps. And misadventures. That's a good concept, but it gets boring for too long.
Characters: They've gone bland and boring, their streak of uniqueness didn't last in the final parts of the show, mostly in the newer seasons.
Humor: Also went boring. Unlike it's first airing and episodes, it's funny and really unusual.
Art: Average art. Good animation.
Overall: 5.5. This just went boring for some reason.