I actualy liked DMC2 gameplay wise ..but as for the story when i think about it compared to 1 and 3 ..it is completly of track..
i mean 1 is VS that dark lord guy i forget the name cuz i aint played it in ages. and in 3 he's trying to stop the demon world from being opened ..and stop his brother from gaining his farthers powers... But 2, that was just some business guy wanting more power in dark magic/power creating demons and the like ..kinda out of wack tbh.
Anyway if you say you switch between Dante and Nero its ether gunna be like DMC 2 with 2 disks .. 1 for each char .. or like say .. Legacy of Kain : Defiance. where you switch to the other character roughly after each chapter or major cut scene in the story. Ether way is fine to me ..though i prefer the Defiance way