I have a G2. I love the way it feels in my hand (although it's super fragile and will chip easily). I love the button in the back (I never have to guess where it is, even when I'm setting the volume from my pocket). And I love the knock-knock feature (although, that only works about 70% of the time).
And I love the guest feature that's better than anything Samsung, Apple, or Google has. It basically logs you in as a guest depending on the unlock pattern you give it. And if you leave most of the apps available to the guest, the guest has actually no idea he/she is in guest mode.
That being said, I concur with the bugs of the lollipop update. I wish I hadn't updated it. The battery drains more quickly now. Sometimes the phone freezes (especially in areas where cell/wifi connectivity is intermittent). I know the phone is old, but it never used to do that before. The carriers are right to wait until these little things get worked out.