I really enjoyed this show -- I taped every episode and watched them numerous times. I found the idea of seeing the capitol from the perspective of a mouse to be very interesting, and the animation, while not the best I've ever seen, was quite acceptable. And since I consider The Simpsons quite distasteful, I was glad that the humor on Capitol Critters was clean as well as funny.
The premise is familiar -- a character removed abruptly from his familiar surroundings (in this case a country mouse, Max, forced to leave the farm where he grew up) and finding his way around a new place (in Washington, where he's gone to live with relatives.) I liked the idea of the relatively naive Max taking on big issues and trying to make a difference.
I'm a fan of Neil Patrick Harris, so it was nice hearing him as the voice of Max.