I'm giving it 4 stars because it's a great exhibition of pop art if you're into that sort of thing. It's quite eclectic, so aficionados of the modern and pop art culture should have an incredible time here.
The museum itself is on the north side just across the river from downtown Pittsburgh, so it's easy to walk to. The inside is very clean and spacious. There are seven floors, so the stewards recommend starting with the first floor, going up to the seventh, and then work your way down.
There are many pieces of Andy's work on display, and actually there are lots of bits of historical and biographical information about the era he grew up in and how it influences his choices and approach to art. There are also many other artists' works on display, so you'll have to read the descriptions to know whose piece you're looking at.
Overall, a great museum and worth it if you've never been. It's $20 for adults, free if you're a local student.