I'm partial to gas station sushi, myself.

As for Zanmai, it is a mid-range chain, not bad, but not outstanding or memorable. A formerly very prolific poster in these them boards was a big fan of the place and would make the point regularly that Zanmai was far superior to the top-end places. Don't know if he really believed what he posted or he was just being obstreperous, but my observations align with yours. I'd eat there if it was 4 AM and nothing else was open.