I guess it's a taste thing, but I adored THE TRIP and found it surprisingly moving. I suppose the sequel could be worse, but from all the reviews I've read it sounds like it is quite similar to the first in quality.
Also if it's anything like the first film there's a lot more to it than trying to make each other laugh. It's also two actors playing versions of themselves at different points in their careers, playing status games with each other, with the Steve Coogan character also having to deal with a career he feels isn't what it should have been. It is all about the artistic ego, the pain of not living up to your expectations, family vs career etc.
And also Michael Caine impressions
.
At any rate, maybe this second one is dreadful, but I'm still going to give it a chance. I'll report back my thoughts!
ETA: I should add that while there usually are funny moments, it's actually much more of a somber thoughtful kind of movie. Expecting a hilarious comedy is definitely not wise
.