Memes aside (which I find myself saying far too often), Leo is pretty good. There is a very noticeable similarity in his acting in most of his roles. They all kind of talk with the same sort of intensity. Essentially, it's almost like he's playing the same character. There's a specific tone he can't help but take.
I like seeing him in movies a lot though.
Does he deserve an Oscar? Sure. He's above average in his field and certainly better than some others who have won. He's never been the absolute best out there, but he's always been good. That should be worth something.
Edit: Do I think that anyone who makes memes about it is human garbage? Sure.