You're going to blame all this on Collins, though?
The reason he was good last year is he wasn't asked to do much. This has been recognized. I'm sure he would do just fine if he wasn't asked to win a shootout or bring us back from more than a score, which has been asked of him 3 times thus far. Fact is, he's not that kind of QB anymore, nothing has changed from last year to now. The defense is killer, the offense didn't get worse.
A lot of things go into the offense, for example. There were two times yesterday Heimerdinger called a run up the middle on 3rd and long... there's two 3 and outs. Once he ran a a little flare to a WR on 3rd and long, again, nothing. Not that Collins would have made that play, but he wasn't given much of a chance.
The sad thing is, Collins still gives us the best chance to win; and he's not able to do what we ask of him now.
Not sure how you don't see that, unless you're just looking at the box score each week.