I saw Sweat last month at ACT in San Francisco, and while I understand Brantley's critique, I can't agree with it. The play is one long tragedy about a way of life that was taken away from people, told from a variety of perspectives, and thankfully grounded in reality. (The comparison between this play and the too-clever-by-half A Doll's House Part 2, which is playing at the Berkeley Rep, was striking when I saw both recently.)
The twist at the end is devastating, even though I really should have seen it coming. My only quarrel was with the last line, with felt a little too pat. But I wasn't too bothered by that. Despite its Pulitzer, the play feels underappreciated for reasons that baffle me, especially given its timeliness.