Yeah, I know. I couldn't resist making this point.
I've thought about it ever since my self-imposed (and very brief) exile, and what bothers me is the use of the word "critical" to describe what happens when a 20 is rolled in 4e.
The word "
critical" means, among other things:
"of decisive importance with respect to the outcome"
and
"Fraught with danger or risk; perilous"
If a "critical" strike is not really a "devastating blow," as Plane Sailing has rightly pointed out, then why use a misleading term? Wouldn't it better to just say that a 20 causes maximum damage without calling it a "critical"?
Now, if rolling a 20 had additional effects, like causing the foe struck to lose a turn or become dazed or have to roll a Saving Throw to avoid going unconscious or dying or having a limb disabled or whatnot, then that could be called a "critical" strike. You have all very well shown that a farmer, even when he rolls a 20, is no threat to a hero. Why call such a blow "critical," then, when it is anything but?
It's just a max damage attack. Nothing critical about it, unless, of course, it reduces someone to negative hit points, as glass pointed out.
I am going to also freely admit, before someone thinks I'm being a grognard or whatnot, that this is a problem with all editions of D&D that used criticals that merely caused an increase in hit point damage, instead of some special, truly dire effect.