I go here quite often for lunch to get out of the office. As there are not many Mexican/Tex-Mex options near my work, this is my usual go-to (unless I order Chipotle ahead of time). The employees are very friendly & quick with moving the line.
My usual order is two Funkmeister tacos - I fill up on veggies with my choice of meat (with no side of queso/guac or a drink, it comes to $5.67). The portions are pretty consistent. The free chips & salsa are a plus & their salsas (especially the salsa verde, which is a permanent item) are quite good. One day I hope to figure out the recipes for them so I can make them at home.
To keep things interesting, they have a limited time item in addition to two seasonal salsas. For example, this summer they had the Ancho Lime Bowl, which was what I got if I was sick of getting two tacos. The two seasonal salsas (for now) are Cucumber Mojito & Light My Fire. These'll probably change in the near future.
You get a decent amount for your money; however, the food is a bit bland, like others have said. I'm into spice & heat. Moe's will not provide that, BUT they will provide you with a quick meal for not a lot of cash.
P.S. The woman who cleans the salsa bar busts her butt to make sure it's clean, especially during lunch. She's also quick with refilling the salsa if you let her know that one is running low.