The most prominent of the criticism is actually from the same people that criticized the F-15 and later F-16 upgrades.

This is an excellent read that has some chapters that covers the "Defense Reform Movement", if that link doesn't work try this.

For further reading on the reform movement try this, it's an excellent take-down of the DRM.

Here's a recent article that cover's some of the similarities of the F-16 and F-35.