While I am not an avid reader of the spider-man comics, I do pick through to find what catches my interest. The Morlun portions in the Amazing Spider-Man really interested me, and provided a very good background to why Morlun and anything vaguely like him is so terrifying.
There was one portion that confused me due to having not read the comics concerning Ezekial because I thought he was trying to help Peter escape Morlun, rather than put him away as a sacrifice for something else.
There is also an arc of 12 comics that crosses back and forth between Friendly Neighborhood, Marvel Knights, and Amazing Spider-Man that includes Morlun and gives a wonderful psychological view of Peter.