Cough, Touchwiz.
On my Note device, I've done everything I can to hide Touchwiz and go back to stock Lollipop because of how much better it is.
To everyone else it was an incremental update.
Don't blame Samsung for that, my Nexus 7 did that as well. And in Netflix the dialog appeared behind the active window so you couldn't see it or hit the button.
Lollipop's first release was a bit of a mess in terms of bugs (it has since gotten a lot better, at least on devices that have kept up with releases, like Nexus devices), but I'd still run a stock 5.0 release as a daily-use phone OS over any Touchwiz release ever.
I can't begin to describe how terrible I find the Touchwiz interface relative to stock.
The downside of having an open platform is that OEMs will add crap to differentiate themselves - just look at the weird media bs that comes pre-installed on tons of windows laptops.
I think Google knows that the status quo with Android is unsustainable and will need to migrate to a more tightly controlled business model. Samsung's flirting with Tizen hasn't paid off and they're more or less stuck with Google dictating policy now. The monthly security updates thing sounds promising as well. Its time Android got serious about security and updates.