NFL Week 8 Predictions: Which QBs Are Guaranteed to Disappoint?

The more that NFL offenses become reliant on the passing game, the more pressure gets put on their starting QBs each week.

It also increases the chances of some QBs dominating just as much as some QBs disappointing. That said, here are three QBs who will disappoint in Week 8.

Kevin Kolb, Arizona (at Baltimore)

Say what you want about the Ravens' performance on Monday night, the defense still played at a high level. In addition, Baltimore plays better at home and the Cardinals have been disappointing each week.

What's more, Arizona is lacking a lot of confidence amidst their five-game losing streak and they play much worse on the road.

WR Larry Fitzgerald is their only offensive weapon and Kevin Kolb is underperforming.

This week, Kolb throws two picks and fumbles once against a very hungry Baltimore defense. He only throws for 150 yards, to boot.

Mike Vick, Philadelphia (vs. Dallas)

This is a big week for both Mike Vick and Tony Romo. However, Vick will be the one to disappoint as the Cowboys have a much, much better defense.

Philadelphia has yet to really awe any cynics this season (at least in a positive manner). Beating the Redskins wasn't impressive.

This week, Vick throws for only 180 yards and two picks, while getting sacked four times.

Dallas has a sick pass rush and the NFL's No. 1 rush defense, so don't expect Philly to be anything but one-dimensional.

In addition, this is one of the few games where Dallas' opponent has more pressure than they do. Philly has been labeled the paper champs, but until Vick proves he can lead them, they will only continue to disappoint.

Tim Tebow, Denver (vs. Detroit)

Yes, Tim Tebow getting the win over Miami was a good first step. However, do not forget that it was against the winless Dolphins, who have a coach on the hot-seat, a backup QB under center and no confidence.

This week, the Broncos welcome the 5-2 Detroit Lions—losers of two straight—who might be the most angry team in pro football. With that in mind, Denver still has a ton of improving to do on both sides of the ball. Furthermore, they need to play better in the first half.

Tebow throws for only 175 yards, with one pick and one fumble, as Detroit's solid pass rush gets the best of him.

The Broncos won't be able to keep pace with the Lions offense.

If Denver has any success, it will be through RB Willis McGahee on the ground. After all, the Lions are susceptible in the trenches.

Be sure to check out John on Bleacher Report. 

And, you can follow him on Twitter @ Sportswriter27.