I've been seeing Anthony Anderson on commercials for Law & Order, the last couple of months, so I assumed Black-ish had already ended.
I always enjoyed the show, but haven't watched it in a few years (there was a divorce angle a couple of seasons back where the show got less funny, IMO). Never must see TV for me, but always a show me and the wife could mutually agree on when deciding what to put on.
On the Cosby show comparisons, it's probably somewhat fair. Not a cultural phenomenon or anything, but a black centered show that can still appeal to the larger white audiences. Closer to Fresh Prince than the Cosby show though, probably.