Keeping it simple, Yogis Grill is an excellent choice if you're in the mood for sushi or other popular Japanese dish (albeit Americanized), but don't have the time or money to eat at a fancy Japanese grill.
The 4-Star rating is not comparing it to a high end sushi/Japanese restaurant, but rather comparing it to others in its own class.
The service was great; we weren't rushed. The facility is well kept and clean. We got our food in a few minutes after ordering, which is a huge plus over the typical 15 minute wait for sushi.
The food was surprisingly good. We ordered a teriyaki chicken bowl and two different sushi rolls. Honestly, it wasn't bad!
Here's what kept it from being a 5-Star (in its class):
The soysauce was watered down and the wasabi was weak.
Overall, a surprisingly good expereince for a fast food Japanese restaurant. I'm sure I'll find myself here again when I'm in the mood and in a rush.