Since the launch of the 4S also put it in the hands of Sprint users, it has allowed a significant number of new users access to apple products. Indeed, that is precisely what I did.

How many users upgraded from a 4 to a 4S? or an earlier model?
How about upgrading from a competing smart device?
Number of users obtaining an Apple device for the first time?

From what I can see, the expectation for an iPhone 5 was extremely high, so the 4S was a let down in comparison; coupled with the Siri controversy that put a bit of a black cloud over the affair.

I'd also contend that share prices of a company that makes and sells physical products don't necessarily give an indication of the health of a company, or the success, or specifically failure, of a given product.