I didn't have any issues with the service, since my boyfriend and I came at around 8:45/9pm. Our waitress was attentive and got our food out in reasonable time, but came by three minutes after taking our order to ask if she took our order already and double check what we asked for, so I could see how the service could be bad when the place is crowded. Other than that, we didn't experience any issues with service!
The food was good! The Korean BBQ taco didn't taste like it was marinated in anything remotely similar to Korean BBQ sauce but it still had the smoky kick that I look for in BBQ. The ahi tuna taco was good, charred on the outside and raw and soft in the middle. The rice and retried beans were also good, the refried beans being better than most that I've had at my usual Mexican places.
Overall, I'd recommend anyone to give Hot Taco a late night visit. I enjoyed sitting outside and people watching while I ate my tacos, and would come again! This is a prime people watching area, since there are a hefty string of cool restaurants in the area and it's always bustling!