Subjectivly speaking and thinking...
I for one think like this about the new features:
Siri: As long as I can´t speak swedish to Siri or ask for directions it doesn´t matter how many updates/features they throw at it, it´s totaly useless for me.
Facebook integration: Now we´re talking. Small things like posting pictures from the photo app is something I would use everyday.
Maps: I haven´t tested it, but as long as I can´t use maps here in Sweden like in the US, whats the benifits with it? I get it´s a majoor investment in coding by Apple, but how do I as a user benifit from it here in Sweden? Do i Get turn by turn here? If I alreday have an app for navigation, what is the benifits for me using apples maps instead?
Music app: Never use it. I use google music so that I have access to my WHOLE music library and can choose directly from my phone witch song/songs I prefer to listen to online and offline. Still there´s only a facelift as far as I understand (no new features).
VIP Contact: Seems like a nice little feature. Since I don´t want to be notified by all my recieved e-mails, this seems to be usefull for "filtering".
New answering functions/caller functions: Looks good on paper, but don´t think the "common" man would use this much. Seems more useful for workrelated situations. But hey, that´s just me...
Facetime over 3G: Nice, but should of been there from the start.
Do not disturb feature: Nice, not a big feature, but somewhat usefull for alot of people I think.
Twitter and Facebook in NC: Come on! Why not make a widget for facebook here. Where you can see latest news or something. I for one never update my status...I don´t want to shout out to all my friends every five minutes of what I am doing right now. I am not fourteeen years old for god sake. Come on Apple! Do it right!
Alarm with "selectable" music: You can now choose songs from your music library! Wow! Like you can´t do that with thousands of other apps! This should also have been there from version 1.0.
App store overhaul and tweeks: Good tweeks are made. I can continue shopping without being thrown out after one download, new apps are markes with a nice looking label that they are new etc...
Now...what´s missing?
Widgets: Hmmm...I hate the widgets on Android devices. They make the screen ugly and hard to "understand". It easily gets cluttered. I do like widgets in NC though. Batteryhog? Apple could easily set a limit to maybe 3-4 widgets in NC if they needed to.
Quick Toggles: Yes, this is a useful feature that has to be there (In NC). Why? Because alot of people (including myself) constantly toggle WIFI and bluetooth on and off. Don´t question why we do it, we just do plain and simple. One reason is battery concerns, that´s as far as I go explaining my reasons.
Lockscreen: Keep it unclutterd I say. The worst thing you could do is make it look like lockinfo for JB phones. I got headaches just looking at the screen. It´s way to cluttered. But I do feel like there should be something here, something visual that could be useful.
Why do paople think the update is underwhelming? Beacause users don´t care how much coding there is to it, most people don´t even understand how much coding there is to a simple app. They care about what they see and what they can interact with. I also believe in functions/features that automate things. Like "photostream," for ios 5 was really nice and a timesaver for me.