So "the rule" is that once one movie becomes famous for doing something well, that same concept is off-limits to the rest of Hollywood?
The "rule" is that they should be more original. There's a lot more than "ice planets" or "desert planets". And yeah well, while we're at it, there's also more than an energy beam firing at a planet to destroy it. Now if that wasn't a blatant rip off of the Death Star superlaser then I don't know (it already has been a total rip off in that Enterprise episode with the Xindi superweapon, and now the movie ripped it off yet again).
And I'm saying it again, the Scotty in the pipe scene is totally taken from Williy Wonka. Even the design and color of the friggin' pipe is the same!