Don't let the three stars drive you away, this is almost always a perfectly nice place to go for a lunch if you work downtown.
I would recommend getting there early. Not that it always fills up, which sometimes it does, but it's best to get in before the servers get too busy. The difference between 11:30 and 12:00 can be night and day.
There are tons of options from type of shell, to none, to proteins and toppings and sauces and salsas.
And mostly they're perfectly fine. I don't think I've had a single thing here's that's wow'd me and made me order it over and over, but even the strangest combinations will not disappoint.
Also a word to the heat seekers out there, none of the ghost peppers stuff on the menu is very spicy.