^ Pretty much every comment I've read since last night's premiere has been positive, so that's good.
Looking at the breakdown, about 200,000 viewers abandoned it after the first part, but then it was largely stable after that:
'Once Upon a Time' Audience Breakdown
20:00 2,375,800 10.30%
20:05 2,452,200 10.46%
20:10 2,415,300 10.16%
20:15 2,010,300 8.43% commercials
20:20 2,293,300 9.44%
20:25 2,182,500 8.99%
20:30 2,100,100 8.56% commercials
20:35 2,290,800 9.25%
20:40 1,926,200 7.80% commercials
20:45 2,243,800 8.87%
20:50 2,292,700 8.98%