Caught this in Time the other day, too. I realized the critique wasn't particularly positive, but I doubt that Time has much influence on what summer blockbusters will do well. Let's be honest, plenty of bad movies sell despite critics' rants, and TIME is not recognized as an expert by any means.
I do think, however, that the writer does bring up a legitimate concern. SR is either going to be a huge hit or a big bust. I don't see it really falling in between, and there is some reason to be at least cautious about how this film might really do. The world, as Singer has said, has changed, and SR comes out at a time when movie-goers, esp. the fickle young crowd, prefer flicks like Hostel and Silent Hill ... It's hard to say whether that crowd, which makes up a significant chunk of current theater goers, are going to drive sales of SR.
As one in the media biz, I recall reading a few articles about this movie not too long ago that WB is actually aiming the movie towards A35-44 instead, touting the Reeve connection to entice dads/moms who grew up on Superman and want their younger kids to experience him. It's smart, IMO, and it also explains the more classic look of the hero here. Marketers are almost forgoing the teen crowd altogether. Comic junkies will come and the rest aren't likely to care much for SR anyways.