Max Crit and Health
Two things. We max crits and health. So instead of 2d8 + mods we do 1d8 + 8 + mods. I hate critting and rolling two 2s or something equally as lame. We did this before maxing health and we would get one shot quite often. So far it's worked well and makes crits feel good. So when I crit as a dm my players go "oh god." Plus they are jazzed when they crit.