Remake idea...
The comment about it "trying to be great" got me thinking; this movie *could* possibly have come out better if, in Thor's gas station scene, before Thor has a chance to skeletonize the driver, he knocks the raygun out of Thor's hand and drives over it (in a present-day remake I'd get it under the front wheel of a front-drive car so there'd be a nice pop against the rocker panel and a second plasticky crunch under the rear wheel.)
This would leave Thor without a vehicle (driven off by its' rightful owner) or weapon (splat), thus forcing him to THINK. I guess from there on, the movie would look very different....