whether a jap restaurant is good or not, usually I'll do this simple and affordable acid test

just order a Tekka maki as a trial, from there you can judge the freshness of the tuna and what type of rice they are using, also what type of wasabi

if the tekka maki failed your expectation, then most likely the rest of the menu aren't that good either

Crap! someone is cutting cost by using inferior material!
went to Sushi Tei in Suria KK last week, loved their Avocado salad and cheap Maki
but this time they replace the premium crab stick in the salad with the cheapo stick that you can find from any frozen food store
but luckily their Tekka Maki is still priced at RM6, at Kappa Maki at RM2, also softshell crab maki at RM6
They are the only jap restaurant that serve cheap tekka maki and yet still generous in the tuna provided in the roll.