It had nothing to do with it being about aliens that ruined it for me. That I could have lived with. What killed it for me was that it went from a series of stories that depicted the almighty power of God against those who would stand in heresy of him, and, having produced a series of movies of epic proportions, moved onto something else, like George Lucas loves to turn to: BAD Science. The nuclear-resistant fridge, the magnetic properties of gunpowder, the fact that if there was a magnet strong enough to pull finite grain particles from across a warehouse, if Indy was able to pull the shovel directly off of the magnet, it would immediately have sliced straight through his legs from the pull of the magnet. It was all BULLSHIT, point and fact. The acting was shite, the character design was dodgy at best, and that they're still relying on the old standbys was a good sign that they should have rethought much of it. That they moved away from the core principles of God's holy power is one thing, and the appearance of interdimensional aliens did make a unique twist on the world's crystal skulls, an odd and currently unexplainable phenomonon. But, bad acting, bad characters, bad dialog, and foremost, horrendous science were really the nails in its coffin for me.