I used to joke that Gandalf (in the books, not the movies) was really just a stage magician with flash bangs, a fast horse and good PR. Did anyone actually
see him kill a Balrog? Nope. We just take is word for it. As far as we know he realized the Balrog exceeded the weight capacity of the bridge, pretended to destroy it and then hid.
Maybe his staff actually held some magical power but he had to break it to have any effect.
Defeating Saruman? Yep, it was totally his idea to send Merry and Pippin to talk to the Treants to take the dude out. Minas Tirith? Everyone is about to die and he keeps mumbling about how any moment now he's going to open up that can of whoop-ass and then everyone will be sorry. Any time now. Honest. They'll be sorry.
The most he had in the way of actual power was fireworks and scaring off goblins with a flash-bang.
I always thought growing up that Gandalf was meant to represent politicians, lots of talk while taking credit for other people's deeds and spinning their own deeds in the most positive light. Oh, and everybody knows he's really an angel (or something) because he has a great PR department.
Gandalf was a charlatan.
