I tried making stuff sound right, and it usually came out a little better than the shitty tabs most people put up. But then I learned to just do what Wankerness tells me..(tab-wise)
I can see how The Leper Affinity could be much easier to someone with a different general style and background. I think Face of Melinda and Benighted are pretty easy and yet some people have trouble with them. I was able to play the solos to Wreath and Ghost of Perdition about a day after figuring out the notes, and after like a month I still mess up on the solo from the Funeral Portrait. Different songs just demand different things from the player. I mean if I had started playing guitar with a different background, maybe I could laugh at the Heir Apparent solo and be like "omgwtf benighted's too hard."
*HOWEVER*, that does not change the fact that, when asked what Opeth songs are the hardest to play, the majority still mention songs like The Leper Affinity. So it's a valid answer and there's no point coming into a thread with comments like "lol, the leper affinity is so easy" or something.