Comedy is extremely subjective - almost as much as music - so I would never question an opinion like that. But I think Farrell at his best is hilarious. The original Anchorman is probably my favorite comedy. I also love Old School.
That said, I have no intention of ever seeing Get Hard. And not just because Kevin Hart is in it.
Ferrels best is Ashley Shaffer from eastbound and down. Most of it is improv