Originally Posted by TheWildAndTheYoung
and I've never gotten why some people prefer this over Lighting,
That's because the album overall is slightly better than RTL. But one of the main reasons the album holds such a high place for so many, besides the music of course, is because it was Metallica's breakthrough album. They got the opening slot for Ozzy on the Ultimate Sin tour and it exposed Metallica to a huge number of fans that had never heard them before. Both the band and MOP got such a huge boost in popularity because of touring with Ozzy. This album got many fans into Metallica. People tend to hold a special place for the album that got them into a band and that's exactly what happened with MOP.