The beats were disappointing but the production was great. The production (the mixing, vocals, arrangements) was among the best but the beats weren't anything special. I can remember being really hyped for this album too but I don't even hardly listen the whole Chronic 2001 album. The only songs I listen to from it now are "Light Speed", "Ho's A Housewife", and "Still D.R.E.".
Now, The Chronic? That's a classic... that's a masterpiece. I still listen to that album (The Chronic) on a day to day basis. But Chronic 2001 isn't anything ground breaking or extraordinary like The Chronic.