Originally Posted by
PoeticallyPsyco
I'd read that as "can't take 2 move actions in a turn", not "is unable to take non-move actions". Could technically be read either way, but the first one makes more sense since they specified that it can't take standard actions separately.
If we don't asterisk that (or take into account fixes like Dragonborn), this is -0. You could go all in on Swarm damage or something else that doesn't require actions, but outside of that, incorporeality is never going to be worth most of your actions.
If we do asterisk it, well, it's worse than Ghost, but is it worse enough to be a +1*? Probably, but maybe not. I'm very open to having my mind changed on that.