Ru San's makes me happy.
While the wait sometimes is a pain, I live close enough and frequent often enough, that I know the perfect times to go so we can walk right in and get seated. At this point, we've memorized the menu and I like it. There is literally something for everyone and to satisfy every type of craving -- Sushi, check. Bento boxes with a lot of food for next to nothing, check. Noodles, check. Chicken or meat, check. Fried ball of rice dipped in teriyaki sauce, double check.
I think the quality of the fish is no better or worse anywhere else in Charlotte so thats never been an issue for us and when people raise that concern, I always brush it off. The entire menu is extremely reasonably priced AND they have a cheap as heck lunch all you can eat buffet. Sure, you might not know what you're eating but hey, you're broadening your pallet.
It's a loud, fun atmosphere and the wait staff is friendly and almost always on top of their game, they yell hello and goodbye every time someone walks in or leave - it still always startles me, but I enjoy it. The wait for food is usually pretty short and reasonable and my water is always filled. If it weren't for the occasional crazy lines (though, I think thats a good sign in the restaurant world) and the occasional waiter that forgets we exist - I'd be closing in on 5 stars.