i found monty python to be more of a stepping stone to better stuff, like peter cook or spike milligan(who python was admittedly a sad ripoff of anyway). i can still watch python and enjoy much of it for what it is, but it's not the sort of thing that i can really watch with frequency. i'm really talking about the tv show too, because i find the first two movies almost entirely unwatchable now.
so yeah, phase stuff. tim and eric are absolutely like that, to an even greater extent. i can still watch python for a few minutes every once in a long while, but i can't watch tim and eric at all anymore. it's really dumb stuff and once the effect the weirdness has on you wears off, there isn't any reason to continue watching. there's a lot of humor like that really, but tim and eric are really glaring examples of it.
anyway, i watched Up. pretty good movie and surprisingly sincere at times, but they really didn't have the content for a full movie. instead of just being an ok movie, it could have been a tremendous short film. there was about 15 minutes of really great stuff and an hour and change of this fluff that didn't really contribute to what the movie was about. it was excellent for what it was, though, and was a bit more engaging than i had expected it to be.
here's how you make a special-effects driven film btw