Honestly, it doesnt "suck" but it pissed me off that they did not tell you in the beginning you would loose google maps and youtube app... The Apple maps seem to be faster, but any app that used google maps won't work right (like my golf GPS app).
There will be bugs just like any OS, but there will also be fixes.
Podcasting SUCKS!!! I drive 3 hours a day and making it a stand alone app was a bad idea. Also, my one month old Alpine car stereo still works with Bluetooth but no longer controls the FF-REV-next etc.
I have no noticed any issues. Google put out a YouTube app, and I have not had any issues with the new maps. I love the turn by turn navigation. Also I really like guided access, so I can give my 2 year old my phone and lock out the buttons.
Every since I updated to iOS 6, I can't send or receive picture text messages, can't get on the internet without toggling the data roam button often. It's the same on my wife's phone. And there is nothing I can do about it until a new update is released.