Re: I am not going to hurry.
I've installed it on both Nexus 4 and Nexus 10. On the N4 it behaved pretty much as all other upgrades have since I got it - it was crap for a few days and slowly seemed to sort itself out. All upgrades seem to have done that - after a few days they seem to settle down. No idea why that should work, always just put it down to a few reboots and charging cycles before things work as intended. Nexus 10 is less special though and, although more stable, battery life is definitely much shorter.
My main problem is with the design decisions. The loss of the excellent stock email app is poor. The replacement Gmail app is okay but introduces more screen taps to get basic stuff done and I find the inability to turn off their infuriating threading system somewhat annoying. One of the strengths of the larger Android tablets has always been working with them in landscape, which is how they have been designed. Google have clearly designed Lollipop to be a primarily portrait OS, though to be fair they've been slowly introducing this since Jellybean. Many screens are simply a pain trying to use them in landscape now - and functionality has taken a hit in many ways too. For example, pulling down the main menu gave you the opportunity to see the status of the device (battery, wi-fi etc). Tapping on wi-fi then took you to a list of available wi-fi networks where you could choose to join one. Tapping it now just turns wi-fi off. Useful! Now, to find a network to connect to, you have to go right into the settings menu and then into wi-fi.
But one example of so many areas where they have managed to turn an intuitive simple tap into a string of different menus to do the same thing - but their poor performance in landscape is the most annoying thing. Most of the best Android tablet apps are designed to work in landscape - turning the device to portrait simply makes most of those look like phone apps with too much screen space. How is this progress?