A+ on just the visuals alone, which are "O-M-F-G-areyouseeingthisshit???" - stunning.
I will not comment on the science. I'm not in the mood for that kind of debate anymore.
Kudos to Sandra Bullock for pulling off what is essentially "Cast Away In Space." (Honorable Mention to mister Clooney in the role of "Wil-son!") My only complaint will be about Sandra's fear/impact grunting, which grated after the first hundred times. (Hah!Hah!Hah!Nonononono!Hah!Hah!Haaaah!)
On the 3-D front, see it in 3-D. It will not be money wasted. The visuals demand it.