How you gonna say he's funny, then say his stand up game is lacking? The thousands of dollars lining his pockets while you say he's not that good say otherwise.
Unless you're the fucking master of telling jokes on stage and have thousands of fans, I probably wouldn't criticize him based on my own personal opinion of what's funny in relation to grammar, diction, and physicality.
You just sounded like a dumbass saying his stand up isn't any good when he came out of pubs and comedy clubs as the roots to his success.
No disrespect, but humor is subjective to the person hearing it. There's no mold for being a good comedian.
I can't stand Norm MacDonald's lazy approach to comedy, but people fucking love the guy. It doesn't mean he's lacking in any areas as a performer, just for my own personal taste.