TD's and INT's matter, but they are also subject to high variance. Look at Brady: 4 INTs in 16 games last year, 10 INTs in 8 games this year. It's possible for QB's to make perfectly good throws that get picked, and terribly awful throws that don't, so you can't invest too much in a small sample of those stats. Obviously Favre gambled a lot and it affected his value, since he often make bad decisions at critical moments.
Now that that's out of the way, let's establish a few things
1) I've seen a good portion of Cam's games, and a lot of the picks weren't bad decisions. Just tips, bad bounces, etc.
2) Still are 12 QB's with higher INT rates, he's throwing picks at a barely below average rate. It's definitely not bad at all given his offensive production.
3) You can't blow Tebow for avoiding picks when he does it by throwing the ball away all the damn time and taking a million and a half sacks. Yeah it's great to not turn the ball over, but if you do it at the cost of not advancing down the field there's a limit to how much it can help you.