Henry is great. Last year, many opeople saw him as a low tier #1 RB, around where Edge and Faulk are now. This year, not too many people are high on him, but the Bills should be improved, and he wont be playing on a broken leg. Before the Bills collapsed last year, he had 5 TDs in the opening 2 weeks, so he can put up the big numbers when healthy and an offense that isnt crippled.
I think the fact that Henry usually drops to mid or even late 2nd round is what makes the #1-6 positions in the draft even more important this year. Getting him to backup an elite RB like LT or Holmes would be phenomenal. Even SA, Green, etc, you'd be looking pretty good.