Manning and Rivers were more "pro-ready", while the consensus on JP was that he was raw with a ton of upside. Well, thankfully JP immersed himself into the job and the city, and now he's on the verge of taking his place among the better QBs in football - not to mention his draft class.
I really waivered on JP until Jauron came out and admitted that they were forcing him to stay in the pocket and adapt, and then as they gradually let him loose he began to really shine. I, for one, think he'll continue to evolve into a top QB, and I think he'll be here for the next ten years.