Marco’s review assumes that the Fire should be an iPad replacement, and from that point of view I agree with him that the Fire is not. I bought mine as a Kindle (gen 1) replacement, and it does everything I need in an e-reader, plus allows me to easily check my email (thanks to the Enhanced Email app that was free in the Appstore yesterday) and read other content I normally view using Pulse and Evernote.
As an all-purpose reading device, it functions well for me – it would be great if it had Google Calendar integration (are you listening,?) and if Flipboard would create an app for it. If I want to play Angry Birds or look up directions on Google Maps or create a report for work, I’ll use my iPad or a netbook/notebook.