I don't hate the character, though he is super over-exposed.
But I really dislike the disproportionate amount of attention and love he gets in Uncanny Avengers compared to the rest of the cast. I mean it's so obvious that Duggan just adores the character heads and tails above everyone else. I mean, what was ever done with Janet? Even in the Pymtron arc she didn't have many lines, and felt very robotically "oh no" about the whole situation. Same with Quicksilver. We had a few weird pages with Synapse about her uncle or whoever, but that was it and it felt really out-of-place. Same with Voodoo and his brother. Why the heck was Johnny even there? I'd sometimes forget he was even on the team. Rogue got some focus, even besides being shipped with Deadpool. Honestly, the only thing that the characters consistently all did was praise Deadpool and admit they were wrong to dislike/distrust him.
I understand that Deadpool is an absurdly popular character and he's going to be pushed since he's the writer's favorite character...but it felt like it was to the detriment of the other characters which did not sit right with me. So yeah, I can see how people would become sick of him.