I mean, it's all relative. I would suggest that with the likes of Sid, Geno, Letang, Fluery, Murray, Jake, etc and the number of good trades we've made, there hasn't always been a pressing need to go out and get the big fish in free agency.
You can go on CapFriendly and search the GM and see signings and filter out the Pens.
Shero big fish:
Martin and Zbynek in July 2010.
Rutherford big fish:
Christian Ehrhoff in 2014
Hextall:
McGinn and Rutta
Dubas:
Graves
Eller
Acciari
The VAST majority of big names this club has on the roster and resigned are either trades or draftees.