Gimli was more interesting in the movie? Methinks you will find hefty opposition to that sentiment.
I would posit that enhanced tomfoolery instead of grimness does not make the character more interesting.
I didn't think the Frodo/Sam part you mention needed humour either, but hey! whatever...
Not that I mean to pick on you
Amrod but you are daring to cross into waters only previously challenged by
The Saucepan Man, and look at the toll it's taken on him!