Just back from seeing it.
I agree with Dalhousie; for mine, this was by far the best hard sci-fi movie since Blade Runner, and yes, Matt Damon was absolutely the right space pirate actor for the part.
If someone had told me beforehand, the type of music they would use in this movie, I would have said WTF? However, it workeds really well
WARNING: BEYOND THIS POINT THERE BE SPOILERS
Just a couple of nitpicks and questions
1. the obvious one was the storm that injured Watney at the beginning. As has been stated, it could not have caused the damage it did due to the low pressure of Mars' atmosphere.
2. When the HAB airlock malfunctioned and blew off, Watney's helment visor was punctured, and he lost pressure, it seemed to take about 30 secoinds to get down to 5% pressure, but once he taped over the cracks and the small hole, it was almost instantly restored to nominal. Really? That quickly, and what anout the bends?
3. Would taping some plastic sheeting over the gapiing hole left by the malfuntion of the HAB airlock have been enough to keep the HAB pressurised?
4. Could they really have accurately calculated the deceleration effect of blowing the front airlock off the Hermes
5. Would puncturing his glove really have worked the way it was depicted? How was he able to stop it leaking, once Lewis caught him, long enough to get him into Hermes?