I really liked it. For me, I didn't think it was the 5 star epic that some reviewers have tried to imply but I did enjoy it.
If you compare this to Buried, I actually preferred that film to this because I found I got more attached to Ryan Reynold's character and the ending really affected me more than this - probably because you already knew what was going to happen here.
As far as "that" scene goes .. I only really cringed once when ..
.. but other than that, it didn't really make me queasy or anything like that.