Mostly true although students limited to one screen might like the resolution of the rMPB to be able to fit more on the screen. It's easier to be more productive.For college students a rMBP would, in my opinion, be an unnecessary strain on both your wallet and your back. Unless your university has some specific demands for very intensive applications an i5 ULV should be much more than enough. The 13 inch Macbook Air is probably the best choice if you don't need to take many handwritten notes. If you do need handwritten notes (mathematics, physics, chemistry) a Haswell Windows 8 hybrid with a stylus is probably the best choice. OneNote has several advantages over both paper and its Android competition.
The rMBP has many great features, but I think of it more as a luxury product bought because of desire than I think of it as serving any particular function better than its competition. I guess the resolution offers the potential of an enormous workspace on the go, but I don't think many people use it that way.