My original opinion of the game after only a dozen plays was very negative. Not to mention that I wasn't a big fan of the movie.
But after playing it more, and understanding the nuances of the rules, I find it to be a fairly satisfying control-play game. It has two major paths to follow depending on what you're going for: (1) for league/tourney competition, "chaining" between link and amp MB's (or stacking them), or (2) going for the wizard mode, which you'll typically have to accomplish in one ball unless you're crushing each mode the first or second time you play it.
And not only is the amp suit payoff shot one of the tightest in pinball -- making it very satisfying to hit -- managing the risk/reward around how/when to shoot it (due to the crazy strong magnet when you miss) makes for good strategic play.
Last, while the wizard mode is not one of my favorites, and sorely lacking in the auxiliary elements (DMD, sounds, etc.), it is one of the more unique wizard modes out there. I'm not aware of another one in which you are TRYING to get the ball to drain down an outlane.
I wouldn't mind having Avatar as part of a decent size collection, but if its the only one or one of few, I'd pass.