It is convenient, but they basically have a monopoly on campus, so expect to lose your shirt every time you go there. There are a number of restaurants on campus. There a couple which specialize in catered banquets, which you are unlikely to go to. Pizzetta serves pizza and burgers. The food is okay, but expensive.
British pizza tastes weird.
The sauce and cheese are completely different. Pizzetta always has MTV running on a big-screen TV, and it's open until 3AM most nights. Popeye's serves greasy chicken and pizzas. The chicken is alright, but you'd be better off at Pizzetta for pizza. Popeye's is sort of hidden in the large circular plaza below Spar.