I went here with my grandparents and Dad the other day...
My grandparents go here enough that they are recognized by the staff. :)
So you walk in and it looks very much like a mexican 5 and diner. Very bright mexican restaurant colors (turquoise, red, yellow) and neon lights. Modern-ish type decor... but not all the mexican decor like you would find in a normal mexican restaurant.
The full bar was a cool touch though. I didn't get to try any drinks... didn't think I should get tipsy in front of my grandparents. lol
I had the Tiajuana Taco plate... it was good, but nothing to write home about. My dad enjoyed his enchiladas and my grandpa got a veggie platter that was HUGE. Veggie soup, grilled veggies and something else I wasn't able to recognize right away but he loved every single bit of it.
The chips and salsa... I could eat it for days. Awesome.
The fast food side of Julio's is a nice touch, with menus you can take home to decide out of their large menu.