I lived in College Park for over a year, and this Richtree was on my way out of the building, so I've consumed my fair share of muffins. If you're there early, fresh-baked muffins are a treat! Their coffee is not bad but the staff there don't always know how to make all of their cafe menu offerings properly. I recall a few very unholy americanos. . .
There is a variety of grab-and-go items like fresh-squeezed juice and yogurt parfaits which are fine. Their other items (rosti, crepes) are solid but expensive. The ambience is basically "mall food court with cheesy German music playing"--the outdoor courtyard tables would be awesome to sit at in the summer if it weren't for the pigeon mafia swarming all about.
Richtree also has some nice half-price deals after 5, so if you work or live nearby and have no interest in cooking dinner, it's a cheap way to enjoy salad residual sandwiches and salad bar choices.
Richtree is adjacent to a veritable hive of grease and villainy in food court form, so it's really your most conscionable choice if you're setting on eating in the building.