Discogs is great, especially for rare artists. You can sort by genre, format, record label, anything really.
Went through the four recent Iron Maiden albums again and surprised my first impressions have pretty much held up: General hints of the trademark Maiden sounds, but a lot of stuff that's long for the sake of being long. I appreciate how Bruce's voice has mellowed out a bit compared to the 80's, but it feels like sometimes he's just doing spoken words overtop (and disjointed from) the guitars.
That said, A Matter of Life and Death was probably the one album that moved up a few notches. Brave New World is my favorite of the four and can easily hang with the 80's stuff. Montsegur, Dance of Death and Rainmaker are all great tracks off "Dance of Death" (whole album is generally solid, although the longer and less interesting stuff is crammed at the end). And Final Frontier was entertaining until the second half of the album, where it sound like a crappy wannabe prog-metal band starts laying down 7-9 minute tracks...And then "Wild Wind Blows" comes on and it's like, "Just kidding on those last 3 tracks...here's the good stuff!"
I hope they do one more album before they hang it up for good. Can't believe it has been 4 years since I last listened to Final Frontier...