I can't call beating a 5 loss GT team a signature win under any circumstances. That said, 5-0 in bowl games is impressive.
Funny thing, West Va's narrow victory last year over GA (it didn't look like either team put the smack down in that game) is the reason why the Big East teams are ranked so highly this year. Had WVU lost to GA last year, the whole conference would have paid the price in preseason rankings this year. But because WVU got that big win in last years bowl game, it added crdibility to them, Louioville, and Rutgers despite not a single one fo those teams playing a quality OOC opponent this year.
Even as Big east, you've got to admit that WVU, Rutgers, and Lousiville scheduled down this year OOC.