A willing target of an attack is not closing her eyes, plugging her ears, and tying herself up. She's going to stand mostly still, make herself as big a target she can, and do her best to get in the way of THAT attack. It doesn't mean she can't dodge or block other attacks she is aware of. It's the kind of thing where you might just give a flat +5 to hit and call it a day.
I agree that in practice there needs to be a hit roll that is modified in some way. I just don't think there should be any real action required taken to make the character easier to hit. But I think reasonable folks can disagree with that.The idea was that someone can't be any easier to hit with a power than helpless: if a power requires a hit roll, then it's actually difficult in some way to get it to work.
I think there are already too many feats in 4e. But I'd love to see a party that's so synergized that one or two of them actually took that feat.Now, such a tactic MIGHT be good to have a feat for. It sounds like the sort of teamwork thing that one might train and practice. Something like "you may take a minor action to grant an ally a +5 to hit you with their next attack".
I think there are already too many feats in 4e. But I'd love to see a party that's so synergized that one or two of them actually took that feat.