Let me start by saying that I have never had so many issues with ANY other phone ever in my 15 years of cell phone usage. I've been with WP7 from day 1 and have had HTC, samsung WP7 1st Gen phones - never with any issues, let alone SO MANY. On other platforms I've had several android phones and almost all iPhones, The Lumia 900 quality is by far the worst ever. Totally opposite of what I was expecting. Such a pity. I waited for so long for this phone.
By the way, this is my second Lumia 900. Already had the first one exchanged after 3 days for the purple screen issue.
With this unit (white like my last one) which is now about 9 days old ONLY, I have the following issues (some being reported by others and some not). But I'm sure its not unique to me, most people will either notice them after a few more days or weeks of use (mine started appearing slowly and are increasing in number) or maybe they have even bigger issues to report.
Here are the issues I am seeing:
I hope these get resolved in a software update. Not that I'm planning to keep my Lumia anymore. Sorry, but a phone/company with so many issues doesn't deserve my money. I'm usually not this disgruntled, but being in software development myself, this is something I wouldn't consider forgivable for my developers either.
An observation related to the capacitative touch buttons issue: I just noticed today that it happens in loud noisy environments. So if the environment is loud (regardless of whether the phone is playing loud music) it will happen. Strange...