I gave this place three stars, but need to provide an explanation before reviewing:
In high school I participated in a foreign exchange program going to the small town of Nagold in southwest Germany. The town's fire department is by volunteer and my host family put in much time and dedication into the fire brigade. That being said, they had a lot of interest in the firefighting industry. Flash forward: a couple years ago they stopped by Phoenix while visiting the US and really wanted to go to the Hall of Flame. And thus, I had my first experience at this museum.
I must interject and say I'm not really interested in firefighting. Not at all. Needless to say, I found this museum pretty boring. However, I try to think of it objectively. I think they have a lot of interesting stuff if you're into firefighting or have little kids at home. I think it's presented well and theoretically could be entertaining if historical firefighting antiques/artifacts interest you, but on the personal level, I don't really care for it.