In Durham UK here speeds of 1.68Mbps are fairly good for 3g as far as im concerned, its not always this fast of course and I could get much worse on 2.0.0 but also just as good depending where i am.
I think 2.0.1 is switching back to edge a little more where signal for 3g isnt so good, im fairly sure this is because when 3g is bad you get speeds similar or worse than edge and therefore might as well be on edge and save a bit of battery. Which would sort of fit as there are a few comments that 2.0.1 is better for battery life.
Speed on any of these networks is so variable though, signal is far more varied than a wired broadband or even wireless broadband, and we are sharing bandwidth with anyone else connected to the same cell towers so comparisons are often almost irrelevant. Even 2 phones next to each other and seemingly identical could be connecting to different towers and therefore getting different signals and speeds