Are ota updates being pushed out slower for Lollipop then Kitcat? I ahve a 2012 Nexus 7 and still have not gotten the 5.0.2 update. I'd install it if I got it but don't want to have to go the factory image rout.
I upgraded from 5.0 to 5.02 using this method and it only made a slight difference to the horrendous performance I was experiencing on my Nexus 7 2012 tablet.
I ended up installing CyanogenMod - tablet back to being speedy and snappy: http://cyanogenmod.org/
That said, I'm hearing a lot of negative about L, so I'm not sure if I should be upset or not. I think 4.1 had a better interface than 4.4 anyway.
FWIW, I just got mine yesterday. My 2012 n7 was god awful on 5.0 and it seems to be waaaay better on 5.0.2.