i would take the $100 and watch Avatar but ok
so many movies, so little time

At this point Avatar is not overated anymore. A very large percentage of fans will SHAME anyone one who goes as far as praise something tiny from the film. It's become unwritten rule to always point out how overated and bad (unoriginal) and unimaginative the film is. For every avatar fan theirs hundreds more shaming the film

Don't get me started on that blue alien bore fest. Galaxy Quest..time much better spent.

Avatar does look beautiful. But if you don't see it in the theater, there's really no reason to see it. It doesn't tell a new or even interesting story. But it is the first film to use 3D properly. To draw the audience into the world rather than distract the audience by having things flying at them constantly.
I don't know why you're even comparing them though. They're two completely different movies trying to do two completely different things. GQ is more fun, but they're really very different movies.
I just think it's a much better movie and Avatar seriously doesn't deserve to be the #1 box office draw of all time.
What a movie deserves is irrelevant. Since this is factually what happened.
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I just realized I've never actually watched Avatar without Rifftrax.
Philo's Law: To learn from your mistakes, you have to realize you're making mistakes.

Agreed.
I dont like Avatar much. It switches from Science Fiction to Fantasy in the middle of the movie and the story is, well, boring, unconvincing, generic, predictable, bla, meh.
Galacy Quest on the other hand is pure awesome. One extremely scene after the other. Tons of hilarious dialogue. Etc.
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I would patiently watch Avatar for $100 and then spend some of that on pizza to eat while watching Galaxy Quest one more time because it never gets old.