Such a loaded question!
I'd say 11's is a fast daily driver, but not a fast street car. There's a LOT of 10 and 9 second Mustangs, Camaros, Vettes, GTR's, Porsche's, Lambo's, even WRX, EVO...heck even Civic's. Those are "street" cars, but not a lot of them are truly driven daily. They are more just nice weather/weekend rides with full working factory equipment.
I'm leaving out the 6 and 7 second "street" cars that run in the actual fastest street car races. There are plenty of 7 second cars that are licensed and have street equipment. However, I wouldn't consider them street cars despite my buddy's claim that his 2,000+ hp fox body is a "street" car. Something about crawling through a funny car cage and loading the intercooler that's replaced the passenger seat with ice makes it not street to me.