Tempted to do the same, pretty let down by mine. I know I came from the 920 to it but it just feels like a bit of a dud mine :\ might do what I thought I'd never do and go back to Android but having only 16GB of storage on the N4 is a serious ballache.
This has been my first experience with a WP. At first all was great, but the more I use it the more tedious it gets.
Some general thoughts...
I love the WP8 aesthetic. There's no part of me that prefers the look of iOS or Android. My iOS and Android using friends have commented on it too. That said, WP8 is miles behind those other platforms in terms of everyday usability.
The hardware, Nokia's at least, is something else I love. I'm now at the point that I would happily move back to Android or maybe even jump ship to iOS if I could get a device for cheap. But that has nothing to do with the 620 I'm using. I love the look and feel of this little device. Sure, there's the multi-touch issue, but I'd be lying if I said I had noticed it before, or even after, it was brought to light.
The lack of apps doesn't bother me personally. I was never one for installing loads of apps on my previous phones so I can't say I'm let down by that.
So generally positive points aside...
The OS is just not there yet. I appreciate that WP8 itself is only a matter of months old, so I'm an earlier adopter and can expect some bugs and issues that will eventually be ironed out (hopefully). However, I'm continually informed that there are aspects of WP8 that have managed to get substantially worse since WP7. How can that be?
I don't need to mention the Xbox Music issue because my complaints are already well documented. Needless to say, the app doesn't come close to functioning like a regular media player.
The OS doesn't feel particularly snappy. That could be because of my 620's lesser hardware. But I was lead to believe that it would handle everything fairly easily. It doesn't struggle whilst playing games for example, but jumping between apps it's quite sluggish. I'm starting to get sick of the "resuming..." screen, whilst iOS and good Android devices can just jump between processes with ease.
All in all, my feelings on the WP8 are cut right down the middle. There's lots of good but plenty of bad. And there are enough annoyances that at this point that I wouldn't recommend the platform.
And a quick thought on Microsoft. It amazes me that we have people in this thread discussing how MS should be throwing more man power at WP8. Amazes me because this is MS, the biggest tech company around. It would probably be nothing for this company to through a bunch of good guys in to the development of this platform. But seemingly they don't, and I can't get my head round why.
With the Easter break coming up I'm considering sitting down and having a look at the WP8 Dev Center and SDK see if I can't throw together a few app ideas that could possibly help me with some of my gripes. I feel like I may have enough programming experience at this point to give it a go. Plus, it might be fun.