Spielberg: Good at everything, master at nothing?

I thought he was the master of blockbuster entertainment? Jaws was the first blockbuster, then there's Indiana Jones, ET, Jurassic Park, etc. He was so defined by these types of movies that a lot of his attempts to branch out were met with resistance until Schindler's List (and even then, a minority of people will invent problems with that movie just because Spielberg's name is attached).