I’d prefer it if the level of critical immunity is back as it was in 3.5. I think the reason that undead were given the Cha-boost to hp later on was because they were not regarded as tough enough, even with their crit immunity. By taking away the immunity, but providing only the hp boost, they are still not as effective. So please restore the crit immunities!
(Sorry if this issue's been discussed before, but I've not had much time to keep up with most threads!)