I love Patel Brothers! Yes, it's crowded and noisy but that's because it's unbeatable for Indian groceries in Charlotte.
My experience has been very different from reviewers that find no customer service. Employees always seek me out to ask, "What are you looking for??" I do need help finding the tamarind paste or the asafetida but I'm likely to wander around for hours before asking for help. It can be an intimidating experience, being a minority for the first time in your life, but don't take it out on the staff. They will be happy to help you if you just ask.
The prices are amazing for spices, beans, and anything else you could also buy at Harris Teeter. Go for the prices but stay for the amazing produce, the frozen foods you haven't already eaten 50 times and the aisles full of "what is that?"