Personally I loved it - it's one of my all time favourite moies. I find a lot of the criticism of it tends to boil down to whether or not people believe the science expedition was meant to be a serious effort vs just an thin veneer of a cover for Weyland. There's nothing to indicate that it was meant to be serious. E.g. it has the wrong set of specialties for an expedition looking for live aliens, for starters, and Weyland clearly see everyone but himself as expendable.