Wow,
No I won't call you a poser.
I mean, there are "classic" albums by Running Wild and Grave Digger (just a couple examples) that I haven't heard in full either.
I think it comes down to how much a fan you are of a band, or when you got into them.
The thing with Walls of Jericho is that's a landmark german speed metal masterpiece, IMHO.
Glad you got it. Not to pull old school rank, but I had that (on cassette!) even before I heard keepers (Heck, may have even been before Keepers came out).
Ride The Sky has always been the defining Helloween tune for me, though its not what most would call a staple Helloween tune.
Anyone who was at Gamma Ray at Reggies a couple years back probably witnessed my ape shit reaction when they kicked into it!