The lack of notification centre is a bit of a pain actually. Interestingly, coming in from IOS I really find that I miss it, despite the fact that I never used it on the Iphone. I think this is because in apps (especially facebook), it is not always obvious what the badge relates to - this could just be a case of getting used to the apps, but I'm not sure.
I also came from iOS - I can see what you mean about missing it now it's gone, it was pretty handy when a text/email popped up on the lock screen. But conversely, I always hated it when the lock screen got full of notifications, looked messy and I rarely read what was on there.
With the 920, say you've got a couple of messages, half a dozen emails and some fb notifications, you can see that you have them on the lock screen, and it doesn't make a mess.