Sapporo is definitely not the most comfortable environment. Unless you like being surrounded by a bunch of Scottsdale bros and cougars, then it might be comfortable for you. I go with friends or family for happy hour (which, as others said, is all day long in the summer.) Servers are always very friendly, and I love that they seat all of the parties with children in one area of the restaurant-- I'm sure other patrons love that, too.
Beware, though, the food comes out rather quickly and ALL at the same time, so you better condense if you've ordered a lot of dishes. I expect they want a quick turnover on the tables, so indicate if you want any of the dishes as starters.
The sushi is definitely nothing to write home about, but it's quick, lively, and fun to go to every once in a while.