I ate at Don Pablo's my last night in Indianapolis. While certainly not my most memorable dining experience in Indy, the restaurant was colorful, fun, and inexpensive.
The menu was fairly extensive and included the standard Tex-Mex fare of enchiladas, fajitas, tacos, etc. The sangria I ordered was very sweet and fruity (not exactly the way I remembered it from a trip to Spain) -- but certainly tasty.
The restaurant was only partially full when we arrived on a Thursday evening at around 6pm, but filled up while we were there. We were seated at a table next to the fountain in the center of the restaurant, which was a nice touch. There was a mix of couples and families dining out and this restaurant would be a good choice for anyone looking for a casual meal at a reasonable price.