I actually ate there last Thursday with my girlfirend. Hehe, kind of funny, I'm at Universal even on my day off!
Anyways, don't go there expecting a gourmet meal. Monsters is just like any quickservice restaraunt in a theme park, be it universal, disney, sea world, etc. It is designed to have a quick, filling meal so you can easily get back into the theme park, riding rides. Because of the volume of sales, the food can't be that elaborate.
However, I thought the food was pretty good. Rachel had the rotisserie chicken, served with potatos and corn on the cob. It was pretty juicy. I'm a sucker for pesto, so I ordered the pesto pasta with itlain sausage and sundried tomatos. Tasty as well. The cream of brocoli soup is highly recommended.
What got me was the little touches, like the pine nuts and chiffonad basil on the pasta. I dare you to go to Disney and find garnishing in nay of the quickservice restaraunts.