So yeah, I listened to my first Helloween album a few days ago. Keeper of the Seven Keys Pt. I is a fantastic album if only it wasn't plagued by a lot of power metal filler(the worst kind of filler for an album). I'll be honest here, the only power metal album that I've enjoyed front to back is the first 5 or 6(?) albums by Gamma Ray. Anyway back to Keeper, I loved the bass on the album and Halloween kicks ass.
Also Stratovarius albums take forever and all the songs are the same.