I don't know what to tell you: I pay about $1600 for my part of a three bedroom, which is two bedrooms to myself (one is my office), a private back yard, a front patio, and a furnished basement. I don't think I got a particularly good deal on it either, from talking to my neighbors and friends. It's not "luxury," but it definitely isn't a dump either -- from seeing other units in the neighborhood, it's probably strictly average.
The rates provided on these kinds of sites don't necessarily reflect the median housing stock in neighborhoods in Brooklyn, which are frequently buildings where the owner lives in one of the units.