Deep dive update:
I liked Killers probably about as much as the debut. I don't think its highs were as high, but it sounded better. Drums had more punch, in particular. Wrathchild, Murders in the Rue Morgue, the title track, Another Life and Prodigal Son are the songs I liked the most. The rest was all solid.
I knew the majority of The Number of the Beast already, but after listening to the first two albums and then this one, the improvement in overall sound quality is pretty obvious. Always liked Run to the Hills a lot, and Invaders is a kick ass opener. Children of the Damned and the title track are both very good as well. Still not buying the hype on Hallowed Be Thy Name; seems great musically, but all of the vocal melodies are a blur to me.