Have you used a WP7 device? Based on you comments I would say no.
I setup a Lumia 800 for somebody. Firstly, you have to install less. The 800 comes with a full navi and also MS Office. There is also SkyDrive (7Gb free space). I love the camera OCR translation feature!
I installed WhatsApp (free on WP!). ...and a few more that I forgot. All are nice and flawless and WP7 is more fluid then my iPhone 4. Specially when the camera is open in the Background.
I haven't looked at the WP Marketplace top 10 - but same as iOS top 10, there isn't a single app I need from. Most in iOS are games, where I have zero interest in.
What I didn't like about Lumia 800: No screenshot function (no app for it too), and couldn't find a free weather app that has the info displayed on a tile (iOS has no interactive tiles, but Android has that function and I love that).
So what hinders me from buying the 920?
1. It ain't out yet
2. Maybe it's too big, I rather go for 820, ain't out too
3. Maybe price, $500 is the pain limit
4. I have an iPhone 4 and I change phones rarely. Lets talk in late 2013...
I am not a must-have-the-latest person.