Ditto, firs-picked him, and Frank Gore, which I got REALLY late (it's a 6-player league, so sue me), is actually doing much, MUCH more.
On the other hand, I managed to trade for Maurice Jones-Drew in the first weeks (sent Vernon Davis, a good bench and the Steelers D/ST and got a crappy bench which I dropped), and boy, was THAT a bigger let down!
So, all things considered, I think I can't actually complain much about McCoy (I have some unnatural bad luck concerning running backs, they never seem to put points on my board. I do very well with TEs and Kickers, though).