Most other MMOs I've played have a short window of invincibility as you just get raised, this a very logical way of allowing the newly raised person get back in the fight, and we're talking of a 1-2 second window here, nothing major.

Especialy in XIV where you first get an unexplained and uneccessary loading screen as you get raised, and as if being disorientated after that wasn't enough, you are unable to move and will die from the slighest bit of damage thrown your way.

With animation lock being removed for most actions in 2.0 I can't understand why there is no invurnability frames for the raise animation, this needs to be looked into by the devs for sure.
Either add a couple seconds of invincibility as you get raised, remove the loading screen/animation lock as you accept a raise, or a combination of the two.