How about this one? Ben Mendolsohn in "Killing Them Softly" I don't hate the guy, but I can't stand him in anything else I've seen him in, including Ready Player One and Star Wars. Ben Mendelsohn - IMDb
Richard Gere, my most hated actor of all time - The Hunting Party was a pretty good movie.
Viggo Mortensen - I hate his face and his Kermit the Frog shouting voice in Lord of the Rings, but damn has he made some good movies: The aforementioned LOTRs, The Road, Eastern Promises (wherein he becomes, literally, the swinging dick of the movie), A History of Violence, Appaloosa, Hidalgo (I cry in that movie every time).
I will second Ben Mendelsohn, his speech impediment drives me up the wall. But he was suitable crazy in Animal Kingdom which really kick-started his and Joel Edgerton's careers.
I don't consider Cena an "actor", not really, yet. As for Keanu, I heard that his total gross he "made" for the Matrix movies was something over $100 Million, yet donated like $85 million of that to the special effects people that worked on the movies because he felt they're the ones who really made them great.
There's a ton of other Keanu stories out there too, far more than just being a good dude. But donating 80-90% of the $100 mil plus you made on the Matrix trilogy to special effects crew might be up there with as many Make a Wishes as Cena has granted.