It’s taken more than seven years, but New York’s Chelsea neighborhood finally seems to be making good on its claim to being the next great art neighborhood. “It now takes two full days, morning to night, to visit just the best-known Chelsea galleries. But for the first time that I can remember, doing the autumn rounds felt mostly worthwhile. There was real variety on view — of medium, subject matter, approach, scale. More important, there were a few artists and works that didn’t fit into convenient pigeonholes.”