I've been to the Mob Experience twice now. The first time, I was really reluctant to play along and found it to be a bit of a drag to have to role-play. I don't typically like interactive exhibits / shows, so that could just be my issue. The second time, I took my mother, aunt and my fella who were all totally gung-ho to play along and that made the experience ten times better!
I noticed that they have worked out a lot of the kinks from my first trip. The timing was right on from scene to scene and even were able to match up our tour guide properly all the way through, which was not the case the first time around.
The historical aspect was interesting and I enjoyed reading about and seeing the documents and stories of all the mobsters about their lives in and out of the mob.
I definitely recommend it for tourists and locals alike. Make sure to look out for coupons or on one of the free ticket sites for some deals.