Lollipop seems to have broken all sorts of things. I'm holding off.
It's not broken, it's just redesigned for tablets. Where I could see an entire week and read most of my appointments, I can now only see 3 days, 6 hours per day and four (!) letters per appointment name line. Lollipop is pretty cool in general. It has a lot of nifty features, I think. What else were you thinking of when you say it's breaking all sorts of things?
I know a few Nexus 7 2012 edition folk who are having horrible trouble with the tablets (wifi / bluetooth problems and performance). And they removed the functionality of the power key menu so all it does now is ... pop up a menu to turn it off. Quibbles, really. I'm sure I'll be bowled over by the leaps forward eventually. Around 5.0.3 .. or 5.1 later in the year.