Are you a college student, or just a hungry person on a budget, wandering around Oakland craving Mexican food?
Skip the chain crap and visit Veracruz, conveniently located right between the Chipotle and the Q'Doba (and far better than anything either have to offer). Pitt students, or anyone who looks like a student pretty much, even get a discount off the already low prices.
Portions are amply sized, and the burritos come in three different sizes unlike the horse-choker-fits-all style of the big chains. Most of the best stuff on the menu isn't inside a burrito wrapper though, read over the whole menu and ask about any specials if you're unfamiliar, lots of good stuff to be had!
Plenty of hot sauce options on the table or the shelf, tasty imported sodas and juices to wash down your meal (including real homemade horchata) and if you're into either - you can always count on soccer or Hispanic soap operas (or both) being on the TV while you wait.