It appears that way at least. I just checked for 8 seats, and lower levels came up next to the stage. Granted, the show is still 5 months away, but not off to a good start. Of course, people could have opted for cheaper seats, but my guess is sales are low.

I had a bad feeling about this. The band picked up some really bad press from the Mohegan fiasco, so non-diehards could be balking. Die-hards following the sets obviously aren't rushing to get tickets.

They've played Gillette Stadium 3 times:

2002: They gave away thousands of tickets. Attendance was around 43,000, and the Goo Goo Dolls and Sheryl Crow opened up.
2006: Supposedly sold out with Nickelback opening up.
2011: Supposedly sold out with Kid Rock opening up.

Sounds like they're gonna have to add a big name opener for this show to fill the seats.