I really liked Maiden when it first came out, but for some reason it got stale quick. The weird thing is I like all the component parts. Love the music, like the layout, rules, art, etc. I can't put my finger on why I don't want to play it more frequently, but it just doesn't earn my quarters as often as nearly anything else in the room.
I think the game hits a bit of a dead end after your first Trooper and Mummy multiball. They're very difficult to relight and a good one with a mode stacked on top can be hard to come back from. The emphasis on power ramps|spinners|etc is also boring. But these alone shouldn't be enough for me to play it as little as I do.