I admit, there were a few things about the movie that got on my nerves. The #1 thing was Underdog having a master. That was just wrong, but well...its all we've got. And its better then nothing.
It could have been made better, but honestly people have made it out to be much worse then it really is. I'm ecstatic that they even made an Underdog movie. He's my hero and he always will be. lol, I even dressed up like Underdog (complete with cape and dog ears) when I saw it in the theater.
Yes, it would have been better if it had just been a flat out CGI cartoon, but think about it. If it had just been a cartoon, it wouldn't have been the same without Wally Cox as his voice.
Personally, I give the movie an 8/10 because...well, its still Underdog. It may be a little different, but...its still Underdog.