"Blazing Saddles" was mostly hilarious. The scene around the campfire, I could have done without. And the cop-out ending was an embarrassment to watch. Around the same time, Monty Python made the spectacularly funny "Quest for the Holy Grail", and then ruined it with a similar cop-out ending.
But right up until the endings, both movies are great, though I would say "Holy Grail" was funnier in general.
I like most of what Monty Python did (though they did go too far sometimes), and a good deal of what Mel Brooks does (though he goes too far quite a bit).
Eddie Murphy used to be pretty good. "Coming to America" is a riot.
Steve Martin is always worth watching. I might even end up seeing "Cheaper By the Dozen", even though the wretched Ashton Kutcher has a major role in it, because it has Steve Martin. He can make even a bad movie watchable.
I would say anything with Jim Carrey is to be avoided. He's not an actor; he's a clown. And he knows it, too. He's always so desparate for a laugh that even when his antics are funny--and they often are--I still don't like him. I admit I have laughed during his movies. But it was the same kind of laughter you give to a jester. He's too needy about his comedy. Whereas with an honest, understated comedic actor like Steve Martin or Leslie Nielsen, even when I'm not laughing, I still like them. Now, I've seen Carrey in dramatic roles, and I saw "Once Bitten", a comedy he made before anyone knew who he was. I know there is a spark of talent there. He's not a complete talentless imbecile like, say, Pauly Shore. But he's gotten so huge--and wealthy!--acting like an imbecile that there's no incentive for him to develop his talent and rise above clown status. So I doubt he ever will. I hope he does. I would love to see him play a role honestly for once. He even sort of came close in "Man on the Moon", but unfortunately, I give him lower marks for that one because he was playing the role of a comedian that I loathe anyway. But I'm still not holding my breath.