Did you like To Catch Me If You Can? He was still quite young when that was filmed, around 25. I feel his career has fallen off a bit in the last decade. Maybe not his fault, but I feel some of the movies I thought would be great, were let downs.
Inception
Shutter Island
Great Gatsby
J Edgar
The Revenant
Django (I also havent liked a QT movie in a while, so not blaming Leo there)
He acted well in all of these no doubt, just the movies didn't come together well for me.
The only movie I have really liked since Blood Diamond has been The Wolf of Wall Street. Despite his accent, I really like Blood Diamond also.