The X Factor is a killer album, it just oozes atmosphere. The Edge Of Darkness and 2am are two of my fav Maiden songs, and there is alot of other good stuff on there too.
Virtual XI is weird, I agree that every song is flawed in one way or another (except maybe Como Estais Amigos, awesome song that), but at the same time every song has something about it I dig and has huge potential. It was just handled very poorly. Stoopid Harris. He still comes out with some great lyrics though, not everything he has done since the early 90s has been bad, there is some great shit in there.