the functionality of some apps is straight

status. the same app thats

on android or iphone.
This was my experience... The same official apps were not as functional as their Android counterparts. I also found that (at the time) the free offerings were not as good quality wise as on other platforms.
I copped the 920 a day or two after release and had it for about 4 months before giving up on the platform. Cant speak on it for the last 6 or so months though. My experience was that the OS isn't complete trash but it is better suited for someone who either isn't technically savvy or doesn't use their phones to the full potential. Unfortunately for MS, the iPhone completely fills that void with a very large app store to boot.
Downloading/managing PDFs/zips/mp3s was cumbersome without a true file manager or a computer available.
All in all, I was admittedly already spoiled by the openness and flexibility of Android and it was hard to adjust to a closed OS. It didn't offer anything more than its major competitors. If this would have come out in 08-09, it would have had a decent chance..