I have been to Barrio Queen 4 times now and have never experienced the inconsistency of service that some other yelpers have.
Service has always been great! Decor is pretty bold and unique and they have a really cool customer engaging trinket in the lobby. When you walk in there is a mural of hearts to your left. The idea is that if you touch one of the brass hearts on the bottom and someone else touches the other one then you connect hands the hearts above will light up if you have kinetic synergy. It's pretty cool.
Anyways on to the drinks. Their iced tea is really yummy, their margaritas are fantastic but they don't carry deep eddy vodka - whaaaaa' *said in minion voice*
For the food - I don't like spicy, seriously if anything is even remotely spicy I get the hiccups and can't taste my food - it's just not pretty. That being said I know this place won't be for everyone but I really enjoy the food here. I like the salsa and guacamole (they have salt and pepper on the cart but it's an ask for what you want thing so just ask if you want spices in it.) my favorite is their carne con verde cup. It's very tasty and the meat is super tender. Their chips are homemade and the tacos, albondigas soup and enchiladas I've tried were all pretty good. Their elote could use some love, I can't put my finger on what it's missing but I've had better. All in all I will definitely be returning.