Since there isn't many Japanese restaurants on State Street, Wasabi is considered one of the most go-to Japanese restaurants around the area. With its reasonable price and decent food, I went there often with friends to satisfy our sushi cravings.
However, I wouldn't say it's the BEST sushi in Madison. Other places such as Takara or Ginza of Tokyo are just as good, with decent quality food and good service. The noodle soup at Wasabi taste okay, but are not very authentic, and the sushi are fresh, but not overly impressive.
I do think that Wasabi is comparatively cheaper than other Japanese restaurants in town, and it's a nice place to have a relaxing get together with friends, or by yourself for a quick lunch!