Ebert made his name in movie criticism but he was one of my favorite writers, period. I've read him since I was in junior high...it sounds silly now, but the way he would give four stars to what seemed like just a shallow blockbuster action movie but then justify it for doing shallow action wonderfully...that taught me a lot about how to judge things on what they purport to do, rather than just against what you, the writer, prefers.
As good as his four-star reviews were, I still loved reading his 0 to 1 star reviews. He was at great at ripping movies as he was as exalting them.