The thing about "consistency in the playoffs" is that the teams that win the Superbowl are not always consistent. Joe Flacco isn't consistent. Neither is Eli. They both have had great games against good opponents, and really bad games. Short of hitting on a top 5 generational guy, you want a guy who, at his best, can play great, and you accept that he's gonna have some games or years where he'll play worse and fall short.
Flacco is a good QB for this reason. He's had great games before, but whether it's luck, streaking or what have you, he put together a couple of his best to win a championship. So did Eli. And both of those guys have had really bad years as well.
Rodgers, Brady, P. Manning are all great because they are consistent. A down year for one of those guys is an above average year for a Flacco/Eli QB. But Flacco/Eli both have the potential on any given Sunday to outduel one of those guys if they play well. That's the kind of QB I want to target short term. That's why I want Cutler. His season stats are a little above average, but not spectacular. I get that. But is there a available QB with a better chance to throw for 400 yards and 4 TD's on a random game? If you had to pick one QB out of the guys available for trade/FA, who gives you the best odds of winning a shootout against a great QB?
That's the main reason why I, personally, don't have as much faith in EJ as I would like in delivering a Superbowl. He's had some good performances with good team performances, no question. But I haven't seen him elevate to that point where I go, "Woah, we could outscore anyone with EJ playing like this." I know it's a tall order, but I wish I had seen that.
In short, I want a guy who has had multiple "hot" games where he's flat out dominated. I don't care about his lows. Consistency be damned. Just give me someone with a shot to play at a Pro-Bowl level for a game. That could be enough, with some luck.