@instantryan: In the specific situation with the boxes, it's established in the book that he goes through their shit, and when he's done with one box he moves on to the next. There's more flavor text there explaining the interests and personalities of the other crew members. Overall there's more characterization of the other crew members, there's a whole romance subplot that the movie skipped (which was a good decision for pacing). The book focus more on NASA than the other crew though and the other crew members don't really come into play until the later stages of the book, so I don't think you missed too much.
I personally think that the movie did the right decisions, and it's the best book to film adaption I've seen yet. I think it was a smart move to for the movie to focus more on the "NASA trying to get Mark home" parts, than "Mark surviving", it makes for a more compelling and faster movie narrative. At the end of the day, the book's strongest theme were "people working together to solve a problem", which meant that the NASA parts took priority over the Mars parts, and why most of the NASA parts were intact from the books, while most of the cutting happened in the Mars parts. While I agree that it's a bit disappointing that they cut some stuff from Mars that I also was hoping to see, I think it's the best compromise for the what the movie went for.
Counter to your point, overall I feel that my enjoyment for the movie was enhanced by reading the book. Since it did such a good job following the book (for the most part), I found it really fun to have it visualized and compressed in a really well paced and fun, but also emotional way. Except that I really didn't like how they changed the ending, that was too much, and it shouldn't have been Lewis who did the EVA. I did really enjoy the epilogue though, especially seeing some of the minor characters from the book and what happened to them.
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