As i said in my reveiw for King of the Hill, i`m a big fan of Mike Judge cartoons. Beavis and Butthead was one of those shows that i would wait up till 2 in the morning to watch. I couldn`t wait for this movie to come out at the cinema. I saw it twice.
As the review below explains the plot, i`ll just say that if you want to switch your mind off for a bit and veg out, this is the perfect movie to watch while your doing it.

Having seen and disliked a lot the MTV "series" of Beavis and Butt-head I wanted to experioence what it would be like in the big screen. I wasn't dissapointed, it was a very poor movie, but at least there weren't those commentaries over video clips. The story is as follows:

SPOILERS
They loose their TV and try to find it, but on their way they get involved in a plot to assasinate a woman who stole a very important viral device or something. They travel through America and, in the end, they save the day and get their TV back.
END SPOILERS

I don't want to offend anyone, but this movie was meant for people who find two guys laughing and saying the word "cool" funny.
The animation is better than the TV series but it's still pretty bad. If I were able to turn back time and not know anything of the Beavis and Butt-head phenomena, I'd do it right away.

Well ... BEAVIS AND BUTT-HEAD DO AMERICA... it's exactly what you expect from two animated morons who don't know a thing about the world outside their living room.
I thought that this could be horrible but it wasn't as bad as I thought it would be. To be fair, some scenes and incidents where actually really funny. I didn't laughed my head off but I didn't felt that I completely wasted my time either.
Definatly not a "must-see" but when you're in the mood to watch an anmiated version of films like JAY AND SILENT BOB STRIKE BACK or HALF BAKED! than this will fit the bill.