I agree to some extent. I just bought a Kin Two and am absolutely loving it. and I've had my fare share of phones over the past 5 months. Gone from the iPhone 3Gs (which is awesome), to the Palm Pre (which is also awesome, just a tiny keyboard), to a Droid Eris (not awesome, major problems), to now my Kin Two. Honestly this is a super snappy phone. Navigating through the menus is super quick. However I will say this is totally focused towards social sites and such. Here is where I agree with you. IM would be a definite plus in this department. You think it would make sense you at least give it Windows Live Messenger. Calenders Im okay with not having, but I realize this is a major issue for some people. Recently there was a press conference with reps from both Verizon and Microsoft (I wont post the article because I don't know this site's policy on linking outside sources) who said they will be adding app functionality like on the Zune HD, and their overall plan is to merge Kin OS with Windows Phone 7, which is pretty cool.
Overall I must say that this phone may not do a million different things, but I can say that what it does do it does very well. And after going through so many phones that can do some many things I'm really happy that I got this phone and brought me back to a simpler level.