Hadn't seen that clip before, so I found it funny!
I agree that he does have (far too few) moments of genius, as demonstated in the sketch where he took the night train to Scotland, but really, apart from that, he doesn't do much for me.
Eddie Izzard, on the other hand . . . !
I hear what you're saying about a poor man's Norman Wisdom, but really, not everone can be original.
There are some fiendishly wonderful performers from all genres who, knowingly or not, mimic others before them who have been hugely successful. I mean come on, seriously, are you telling me that Justin Timberlake with his almost perfect take on Michael Jackson is bad???? His lovingly crafted/copied 'woo hoo' and grabbing of crotch etc.???