I have to wonder if those of you who don't appreciate Matt's know what to order. Having grown up in San Antonio, I've found that you have to go certain places to get certain dishes. If I want enchiladas I go to Blanco Cafe. If I'm in the mood for fajitas, I'm going to Alamo Cafe. Etc.
Matt's enchiladas are average. Matt's steak tampiquena is out of this world. Matt's tacos al carbon will bring you to your knees. Matt's queso fundido is unrivaled in Austin. Matt's has GREAT chips. Matt's frijoles a la charra are way above average. Matt's can make a margarita...and they have a great selection of tequilas.
Basically, if you want a high quality piece of beef Mexican-style, Matt's is your place. If you go in there and order ground beef tacos and wonder why you didn't have a decent experience, well, you ordered wrong. If you just want a plate of enchiladas, save your money and go elsewhere.
My Matt's reccomendation:
Start off with a top shelf Margarita and enjoy their GREAT chips and hot sauce. Order the queso fundido as an appetizer (It may be called something else on the menu, but the waiter will know what you mean). Order the steak tampiquena cooked medium rare. If you have a sweet tooth, Matt's has all the traditional mexican desserts...and they're good.
Eat that and then tell me Matt's sucks.