Hello there,
I played D2 for a long time, and most of it in classic (after playing LOD).
The reason behind that choice is that the game is much more balanced, items are not over-powered and hell actually feels challenging.
However I never played classic because the classic stash is so small. Nor because we can’t play druid/assassin, nor because we can’t go act5.
But the better balance made it worth it.
Anyway with D2R, when I heard stash was bigger now, I was really disappointed that the classic stash has been left as it used to be. Please fix that, people don’t play classic for such a bad limitation.
Adding Act5 and assassin and druid would also be beneficial in my opinion, but that would probably divide opinion.
I recall that when Act5 was available in classic (due to a bug sometime in 2000’), people where pretty happy about it.
edit: Lot of people are complaining about the stash actually.
See the US forum : [Classic] The Shared Stash - #194 by Geezer-11142 - General Discussion - Diablo 3 Forums