If i get it it'll be only for its gameplay, the epic storyline completely lost its plot and coolness at the end of LOD, weird ending allowing for whatver the hell u like as DIII's beginning; i've been to the blizzard site and they some kind of Diary blog for Cain in which the plot seems already screwed up, normally absolutely nothing of DIII's plot is revealed, just flashbacks of the previous 2 and some "errors" in the storyline along the way - if i remember right
The big 3 have already been defeated (too many times if storyline included), so my perfect ending to the sequence would be facing off against the last 2 of the prime evils which have never shown face in the series so far (Belial, Lord of Lies and Azmodan, Lord of Sin); way cool if Tyrael gets corrupted and you gotta fight'im too!
As for DII, the conversion is c-r-u-d, i powerlevel in the original thing up to 62 then let got of it coz it took too much time to improve, by that time I'd whoop Diablo all over Hell difficulty
..
then came the cursed conversion; out of "carefulness" i thought I'd try the 'travincal council massacre' in nightmare difficulty but i died by the freakin first flayer i encountered on the way!!!
Now @ lvl 62 I'm only good to start at the BEGINNING of the nightmare diffculty, skills like that barbarian weapon tornado is completely useless now that it misses everything at best. And why the heck do I keep getting items as if my level is only 30 or less? too frustrating, and some bosses' combination in Hell level are irraitional, i mean what the hell is physical immune, AND magical immune! wtf, i gotta stand there and just watch it kill me.
there has been improvements in LOD, but they're not worth it; DII beats it any day