To each his own. But, don't look foolish dogging Nama, bragging about your coastal fare, and then posting a pic from a nationwide hibachi chain with consistently mediocre reviews whose sushi likely comes from Atlanta.
There are 8 Miyabi spread across SC, NC, and GA....not sure which chain you're getting it confused with ("nationwide"). And with absolutely no reason for bias, I think Nama sucks compared to sushi I eat in SC. Most Knoxville restaurants are pretty good otherwise.
My bad, I just know I've seen them in multiple places, and I was underwhelmed the last time I ate at one. Looks like the one in Charleston clocks in at about #260 on Trip Advisor, though, so I guess my opinion is fairly common.
Also, visitors from Austin and Florida have all agreed that Nama is fantastic. Sorry you've had a bad experience there. I'd call it one of the 3-5 best restaurants in K-town. If you are back this fall, go to the Gay St location, sit at the sushi bar, and just order a set price chef creation platter using the fresh catch. You can specify what you like or don't, including heat, fruit, etc. Ilk be shocked if you don't change your mind.
#29/89 isn't much to brag about, especially when Texas roadhouse is #21. The reviews look consistent with just about every Japanese steakhouse I've seen (poor service, long waits, hurried dinner, mediocre food).
Again, I like going for hibachi once in a while. I've just never had sushi worth a crap at a place like that.