Why the iPhone 4S was frowned upon

Why would an iPhone be frowned upon ? And that too, the newest one in the lineup. When we think of an iPhone, we think of Apple's beautifully designed phone which, with each new model, becomes increasingly so. Take a look at the image below, for example -


And now...


You might have noticed that there is not much change in the iPhone 3G ( Black ) and iPhone 3G S ( White )
It leads me to believe that the iPhone 3GS and iPhone 4S were merely "upgrades" to an existing phone whereas it was observed and marketed as a change in the lineup. While they do provide attractive new features, the $100-$200 increment in price in comparison to older models may not be very economically attractive especially since the iPhone 3GS is being sold for $0. 
Another reason, in my opinion, for the originally "disappointed" frowns of the reviewers is that most reviewers were basing their opinion on the keynote, which quite frankly wasn't very appealing. With Steve Jobs absence, Tim Cook might take a while to adjust and to be able to give better keynotes. Possibly, Steve's life threatening condition ( Which Apple knew about at the time ) proved to be a distraction. Looking at the same features on Apple's website seems much more impressive than on the keynote. 

Just a thought.