He falls into the 'very good for a long time' category. Not exceptional, certainly not someone who filled you with dread when your team faced him. Statistically, a very high ERA for a HOFer, no Cy Youngs, average in the playoffs. 5 All Star games over an 18 year career. And if you dare mention Gold Gloves, well, just stop. Who cares if a pitcher can field? Pitchers shouldn't even be eligible for the award.
He was an excellent, durable pitcher with great control, for a long time.