I don't agree that the clear choice for the 9th level barbarian, either from a tactical or roleplaying viewpoint, was to cower behind the cleric (who would instead be the proud recipient of 2 negative energy levels). I don't think the situation is as clear as you think when you're a player and you haven't looked at the dungeon like the DM has. (And a DM, with the ability to fudge the dice, tactical circumstances, and creature statistics, is not always in the best position to be claiming that he's a tactical genius.) I would prefer that the players in my campaign keep their minds on playing their characters, and deal with whatever adversity they must. Less time sulking and more time looking to get Restoration spells for the barbarian.
To return the favor, I, as a DM, will spend less/no time talking about what a bad player the barbarian's player is for not running away. Not only that, but I try to avoid designing encounters where I have a certain expectation of how the players will deal with it ("it'll be cool if the players run away at this moment"). That way, I'm less tempted to complain to the players when they don't do what I want them to. And also, everyone is polite to each other, spends their time thinking about the things that they're responsible for, and things are less adversarial so that there is less of a perception of DM-vs-players.
To return the favor, I, as a DM, will spend less/no time talking about what a bad player the barbarian's player is for not running away. Not only that, but I try to avoid designing encounters where I have a certain expectation of how the players will deal with it ("it'll be cool if the players run away at this moment"). That way, I'm less tempted to complain to the players when they don't do what I want them to. And also, everyone is polite to each other, spends their time thinking about the things that they're responsible for, and things are less adversarial so that there is less of a perception of DM-vs-players.