I'm sure there were plenty of people who only bellied up to the ticket counter for Kick-Ass 2 because Jim Carrey had been marketed as a major part of the film. After all, it had been awhile since Carrey was involved something as ridiculous and plain fun as this superhero franchise.
Then again, it's possible that at this point in his career - and considering the vast amount of negative press Carrey heaped on the film due to its violent nature, which he apparently disagreed with despite collecting a hefty paycheck because of it - there were just as many people showing up to watch Carrey get his neck snapped.
For all intents and purposes, it seemed like the filmmakers were attempting to do a clean swap from Nicolas Cage to Carrey. Trailers suggested he'd take over as the default father figure to this group of up-and-coming superheroes.
This wasn't the case, as his character, Colonel Stars and Stripes, was literally broken in half by a villain named Mother Russia quite quickly. One has to wonder if Carrey's negative press didn't persuade the editors to cut down his screen time just a bit.