New Gen has always failed to impress me. When I moved into the Annex 4 years ago, I went here frequently - until I discovered Sushi on Bloor.
Both places (New Gen, Sushi on Bloor) are definitely the two most popular sushi joints on the street. I'm slightly baffled why New Gen gets so much business over some of the other mediocre options on the street.
The sushi is adequate and cheap. You don't get the huge portions that you get at Sushi on Bloor, so if you like big portions, stick with Sushi on Bloor.
I had a few awful meals at New Gen (really greasy chicken terriyaki for one) but generally it is decent. The service is A-ok and decor is nice-ish too.