No DR’s in PVP really was not that bad… The classes that first got DR’s were Mages and Druids, because they were able to endlessly root. Blizzard cracked down on it because it was way worse than the typical QQ complaints people made about rogues.
Bugs, meh… Who really cares since the kinds of bugs they had back then were typically the kind that just crashed your client. Most of the really bad stuff was worked out long before launch.
Vanilla bug’s may have been irritating, but I would rate it as a better experience than BFA ever can be.