Happy Gilmore made me laugh but yea, we seem to be seriously lacking good comedic actors anymore
I don't think it's the actors - it's the writers and directors. Key & Peele are hilarious, they're even hilarious in the movie, but the script just didn't have a ton of great jokes.
I think the thing that's missing is discipline...the classic comedies either had so many jokes that you couldn't help laughing (like Airplane) or the people who made them took a lot of time making sure they were absolutely perfect.
BTW, I saw "Keanu" at the Alamo Drafthouse, which instead of those stupid trivia quizzes and Coke ads, did a 30-minute pre-show cat video compilation.