I suppose I have to admit that I am a big fan of Nokia. I did use several models of other manufacturers, SonyEricsson, HTC, HP, Motorola, but in the end I always come back to Nokia. Strangely, even with all of those silly problems and annoying shortcomings, Nokia phones are still by far the best as, precisely, phones. But why do they have all those problems that force me search hi and lo for a new phone every now and then? Here is a batch of articles that sheds quite a good light onto the problem:

1. Undesirable at Any Price? What happened to Nokia, who invented the smartphone
2. Sherlock Holmes & Hound of the Nokiaville? Why Did Nokia Market Share Crash-Dive? I May Have An Answer..
3. Return of the Jedi: Nokia can be saved, here is the how

I think I agree more or less completely with what Tomi Ahonen explains there. Interestingly, I think those precise problems plague more than a few companies in the world, in many different industries. Unfortunately, nobody listens.