3.5 stars.
An interesting way to spend a day. The exhibits have an interesting flow to them and famous instruments, iconic outfits, and many videos. I was a fan of the Beatles and modern pop star exhibits, but I'm not so familiar with the history of rock and roll and ended up learning quite a bit. Also, the auditorium with all the inductees' signatures on the black wall was super cool to see.
Rather pricey to get in, but if you are a rock/pop fan, it's a fun thing to do in Cleveland.