The best three albums imo are Powerslave, SiT and 7th Son. The overall themes and non-story-book approach is lost on me after that era. BNW is ok, but the artwork is atrocious (Riggs only made the sky/face, the other guy made the mess of a 3D city), the songs dont have that surreal quality to them etc. and they just end up being a bunch of songs with no overarcing theme or story.
One thing I will say, I saw them on the Somewhere Back In Time tour and it was easily the best show I've seen. They havent lost any vigor or urgency at all there. I just wish they'd make some faster soaring songs up, seems like most of the new stuff is that plodding dun-dahdah-dun-dahdah-dun rhythm over and over and that's as fast as they can go.