I highly doubt that even the survey was/is sent to everyone vice only plebes that the rankings would be much higher than they are relative to either the food or the dorm rooms. The facts are:
1) the food hasn't been very good for a long, long time and you only realize it/see it as even more so after your sea year if you've been a a ship that was/is a "good feeder" like say a Matson Lines vessel, etc.
2) The dorms - the remodeled revamped dorm rooms are still small, in fact smaller than the older rooms.... and don't forget that at times Plebes can be three to a room....
When you compare these two items to schools that work at such things - whether public - like say James Madison University here in VA or Private where the conditions wouldn't generally be something that has been seen in a long, long time, it's not surprising that for these items KP is where it is. Further as noted the corporate personality of the Regiment is and always has been to take pride in having things a little tougher than others - whether it's pointing out that USMMA is the only one where Plebes have cleaning stations in the manner that they do (Heads, Showers, etc.) to the ranking of worst college food in America....
As far as things that First Classmen would likely rank higher than their peers - career prospects, and such things would indeed be higher, I think, based on data from First and Upper Classmen than Plebes.....
No data here - just my gut feelings....