Qdoba, 1280 Mass Ave.
Qdoba opened up recently on Mass Ave, next to Bob Slate's. I had been a couple of times to a different Qdoba on Huntington Ave by the MFA, and liked it.
I tried a chicken burrito - a tough challenge for Qdoba given how frequently I order these at either Felipe's or Boloco.
But, Qdoba holds its own. I find the tortillas a bit thicker, so you get more chewiness than the other burritos in the Square. The chicken is flavored with some sort of tangy sauce, which I thought tasted quite good. But in both cases these are personal preferences.
So I'd summarize the burrito options in the Square like this:
Felipe's: Lowest cost, lightning-fast service, good and hearty. Only dark chicken meat.
Boloco: Upscale, little more expensive than Felipe's, more interesting options.
Qdoba: Thicker tortilla, no whole wheat option, good food.
Personally, my preference follows the above order: 1-Felipe's, 2-Boloco, 3- Qdoba.