There are a variety of things wrong with the Colts right now. I could pick on the defense and their inability to stop the run, but honestly, the defense has played well enough to win the past several weeks. It is the offense that has lost them games. If not for this interception streak, the Colts would be at 8-4 or 9-3. Here are some of the things wrong:
1. Manning is forcing the ball. He is forcing the ball into coverages that he has no business throwing it into. In the past, he might have made those throws but right now, the line isn't holding long enough to give him time to complete them.
2. Frankly, I think the offense is too complex for the group of receivers they have now. With the injuries to Clark, Collie, Garcon (off and on), Gonzalez, and Addai, I really think they need to dial it back to something more basic. I'm not absolving Peyton of responsibility for his poor play, but some of those interceptions were definitely because of wrong routes and that is happening way too frequently.
3. Even with the other injuries, I think they could haved treaded water had Clark not been injured. I think his loss is the biggest loss they've had, closely followed by the loss of Collie.
4. With no running game, Manning thinks he has to make the big plays to win the game and that is causing him to force more passes (see #1).
5. I blame the Colts management for the current situation. People in Indy have been screaming for years to draft offensive linemen and defensive players (particularly CB and LB), but Polian refuses to use high picks on those positions. Instead, the last 3 first round picks have been: WR, RB, DE. Dumb, dumb, dumb.