Any band of their status and longevity is in many ways going to be a nostalgia act. No-one goes to hear U2 for the songs from their last record, or Metallica or any band whose been around as long as Jovi have. I mentioned the Foo Fighters before - and quite a few said actually they did go to see the foo's because of their recent songs - which is fair enough but that band is a decade behind Bon Jovi in terms of longevity.

but...I'd say their too big to ever be a simple "nostalgia" act - Bon Jovi songs are more than just eighties songs like Poison or Whitesnake. Their absolutely ingrained into popular culture. I read a book today where it had a simple throw away Bon Jovi reference, just like they've been referenced in hundreds of other books and TV shows, and not necessarily just in terms of their eighties output though that's the one that will always grab the most attention.

As a fan I go to hear all their songs, but of course casuals don't have a clue, but I'd call a band who are only known for eighties hits or nineties hits a nostalgia band, Jovi have had hit songs in the eighties, nineties, and beyond. That's bigger than nostalgia. That's a legacy.