I got about 12 to 18 hours before the update and I still get 12 to 18 hours after the update. So in IMO it didn't suck before and it doesn't suck now.
I had problems also after ota install and after a factory reset it was good for a while and then became bad again. Now I've performed a second factory rest and I am enabling accounts one at a time to see if I can tell what is causing the battery drain. If I were you, i would turn off sync on all account to see if that helps. If not, it could be an app.