Fireball is a game that I've had a sea change on. Playing it when it first came out, the spinning disc and the multiball was something totally different, so I played the game a lot.
It was always at the top of my list of wants. Then I played it again a few years back and my mind changed. I'm not as far down on it as boatcat, but it's also really no longer on my list. I'm not really much of a fan of multiball, because I think pinball is the art of controlling the ball and shooting at targets, and there's really not a lot of controlling and shooting going on with three balls bouncing around continually. And I agree that there's really not a lot to do on the game outside of locking up the balls and then getting them released. Maybe if I liked multiball more I'd like the game more. The kicker and ball return gate, I have on my 1967 Surfers, so it's not really a novelty to me.
I don't think it's a bad game by any means, and in good condition it's a real looker art wise, but as a player, to me it's just average, and not worth what it costs to get one.