This was my first time to visit Las Delicias. Supposedly they recently underwent a remodel. Since I hadn't seen it previously, I can only speak to the fact that the as of right now it looks really hip and has a lovely deck upstairs. I felt comfortable and was excited because a group of hispanic construction workers told me this was some of the best authentic Mexican food in Denver.
First of all, service was a bit slow...good, but slow. Maybe that has to do with the fact that the waiter has to run upstairs from the kitchen to deliver items. I don't mind waiting, so the ramped down timeframe didn't bother me. Had I been in a hurry, I might have been perturbed. Secondly, margaritas were horrible, little alcohol and very bitter. There are other Mexican restaurants in Denver with great margaritas, so if you're here to drink, go somewhere else.
Now, let's talk about the food. I ordered a taco, guacamole tostada and tamale. The taco was good (not great). It was just a taco. I wish it had some pizzaz like sour cream or jalepeños, but alas, just meat and a shell. The guac tostada was the best thing on the plate. It was perfect. Finally, the tamale is what I was craving. I mean, a good tamale can be like a juicy explosion of fireworks specially created for your tastebuds. This was not that. It was ok. I had to ask for green sauce to give it flavor, and that green sauce lacked the tartness I expected, so it was warm and bland. Overall it was underwhelming.
The good news is that this is authentic Mexican food, and you'll get a lot of it. The bad news is that there is plenty of room for improvement. They need to add some kick, some spice, something special. That would take this place from ho hum to yum yum.