Before I repeat myself, does anyone remember what happened last night's game against the Panthers? I'll give you a hint - lots of quick scoring early, including a special teams touchdown and a bunch of turnovers. McCoy barely touched the ball, and was pulled for most of the fourth quarter because it was 45-14. Even his touchdown was a fluke - Sanchez threw a 30 yard TD pass against a Panthers pass D that simply couldn't stop them but he was called down at the one, and McCoy could run the ball in. It was another terrible game flow for him, they were able to pass successfully, they were trying to get Sanchez rolling (and he sucked in the first quarter, completing just two of seven passes and 0 for 2 on first down). They had McCoy chipping defenders, or just outright pass blocking, on most of his plays.
The point is - those were three terrible games, but they're all understandable in context. And the rest of his games are pretty normal for him - he had 122 carries for 583 yards in the other 6 games, and 20 catches for 94 yards.
So for my money, I think that yes, the small sample size that includes three terrible games has badly impacted him. A hurt O line hasn't helped. And he's not dominating the way he did at times last year, although he had some bad weeks last year, too. All this stuff about Chip not using him, or McCoy looking bad week in and week out, or Sproles getting more touches than him - it's all a load of crap. Don't be scared off by the season totals or by a couple of bad, bad games. Even after a bad start, he's still on pace for 1300 yards and 4 TDs - and has played most of his games like a back on a far better pace than that.
He's a riskier play this year because the Eagles D/ST can take over a games and the team no longer revolves entirely around McCoy. But for my money, he's one of the best backs in the league for the second half of this season, with games against the Packers, Titans, and Cowboys twice in the final six weeks, and even the Redskins D, which was playing great to start the year, has been beaten up by DeMarco Murray and, um, Matt Asiata in their last two games. Coming off a nightmare game on national TV, he'll be cheaper than ever before with way more pedigree than guys at a similar price. I'm a believer.