I wouldn't call Panzer Saga a huge game for the very simple reason that it was and is in extremely (repeat extremely) limited release. Kind of hard to call a game only a thousand people could've played a system seller. Plus it was one of those that came out after the announcement of Saturn's eventual US death. Although that was the ONLY superb near-perfect game saturn ever had. The other Panzer's were of the same high quality too, but uh, you must remember shooters aren't exactly everyone's cup-o-tea.
Nights, i can't even call that a game, more of a demo for the analog controller. And if you want to whine about that statement, ignore that, and remember it came out about the same time as Mario 64, totally overshadowing the mimic'ing 3d Nights.
Like i said, there were no big system selling games for the mainstream audience (or really any audience) until the thing started to die.
And if you want to call me retarded for that

I don't care.
Take my number 2 reason for Saturn's death.... ZERO ADVERTISING for the system (until once again, its eventual death, in which they finally started advertising only too late). You'd of been surprised how many mild-gamers back then never even heard of the system.