I think it would be smart to get a little deeper than that and not just take what national pundits say as gospel. Last week Tebow lead the Offense to a successful, yardage wise, first half. What did them in is an INT and a blocked FG, or they would have had points to show for their play.
Last week Tebow was one dropped pass by D. Thomas from passing for 300 yards on the Chicago Bears defense.
Now, all that being said, what makes you think he'll play poorly for the first 3 quarters? Incase no one's mentioned this, this week the Broncos are facing the worst defense they've played thus far.
Oh, and also, the defense has played lights out the first three quarters.