I think what I saw was mostly brilliant, though there was a bit near the start where Rincewind steals that horse and it looks really obvious he's in front of a filmed background, but it only lasts like two seconds and it gets better after that.

Mrs. R. and myself thoroughly enjoyed the screen adaptation of COM/LF.
(Could have really done without David Jason's almost constant grunts and Ohh's and Ahh's on the background soundtrack though.)

R.

It was kind of cool (except for a couple of really lame extras in the background who totally ruined the film, obviously) I still can't get my brain around some of the casting choices, or why Vetinari had to have such a lame accent/speech defect or whatever that was supposed to be. The end of the film DID rock, and on the whole it was enjoyable, just not as perfect as it could have been...

Was a bit disappointed in the casting, but overall, I really enjoyed it. A couple of bits I really like in the books were missed out, but it didn't take away from the story, just me being awkward!