Ok, this isn't a good burrito place. If you're in the area, and want a wrap with beans, rice and some meat - sure, go for it. But if you want a real burrito this isn't the place to go. Obviously this should be expected, since it's inside a mall? I mostly go here for lunch because I work really close - the service is fast and not too nice/rude (it's just a fast food joint).
I usually get either the carnitas or the beef - the meat isn't as spicy as it should be and doesn't taste authentic.
However, even compared to Chipotle (which I love, yeah it's a guilty pleasure...) I find z-teca burritos dryer and much less satisfying :(
There's plenty of room for you to sit - inside or outside, even during lunch it's not that busy.
If you want authentic burritos - go to St Clair.