The San Francisco 49ers are re-making their offense in a big way. There have been plenty of critiques about the offense, and it is not surprising we hear an opposing player say something about the offense. It's certainly far from ideal, but I am not prepared to declare the season lost just because Leodis McKelvin had something negative to say about the Kelly offense.
If you missed it at any point in the past month, I highly recommend you check out David Neumann's work and research on the Chip Kelly offense. We have create a resource page here. It includes links to David's fantastic look at Chip Kelly's offensive philosophy, and it also includes links to a ton of great material about the Chip Kelly offense.