Acting is often a lot harder than it looks,unless they are just being lazy or deliberately stupid,then I cut them a lot of slack
Theres a crucial difference between making it look easy and making it look like you think its easy 🙂
I think a distinction between Gervais and Sandler is – even if you don’t like Gervais’s work its fair to say he works hard at what he does – you might like his performance or you might not but he brings interesting new stuff to the screen. Sandler by contrast is fundamentally lazy, and arguably a bit of a swindler. His movies, generally, are the least they can possibly be, plus a bunch of lucrative cameos for his pals.
Half in the bag put more effort, imagination and humour into pointing out every cheap, lazy, pocket-lining shortcut he made in one movie than he puts into any of his movies. He rips off his financiers, crews and audiences by putting as little of the budget (your ticket money) on the screen as possible and as much as he can into his and his friends pockets.