I agree, from 96-2002 there may not have been anyone more consistent.
I also think he to do the opposite of what his album reports--which is cut back on making beats and concentrate mostly if not exclusively on lyrics. He produced most of the beats on Encore, and most of them sucked. Hes no Kanye, meaning he can't be equally as great on the mic and behind the scenes. He has Dre, unlimited resources, and contacts to any producer out there--why he insists on letting his rhymes suffer for his average ass beats is beyond me.
Hopefully he'll take a page from Jay Z and Nas, both who came back with classics after pretty long dry spells. Jay with the original Blueprint, and Nas with Stillmatic.