Twowolves
Explorer
I think everyone here is confusing "level" with "combat survivability", when levels, especially in this case, should mean "story survivability". Yeah, a level 20 commoner has 20 hp, but that doesn't mean he's so tough he can take on the town guard. It means he's so important to the story/setting that something will happen to keep him alive just a little longer after one sword hit. A 20th level anything, even commoner, should be a legend in the setting, and the level system still fits the bill just fine.
In 3.Xed rules, where with power attack, improved critical, massive damage dealing foes, etc, it really shouldn't bother anyone to have a commoner with double digit hp. They can still drop from one hit by the 1st lvl guy's longsword. Besides, no one but the DM should know his level anyway, and it's all in how he describes the action in any scene involving these NPCs that sets the tone of the game.
In 3.Xed rules, where with power attack, improved critical, massive damage dealing foes, etc, it really shouldn't bother anyone to have a commoner with double digit hp. They can still drop from one hit by the 1st lvl guy's longsword. Besides, no one but the DM should know his level anyway, and it's all in how he describes the action in any scene involving these NPCs that sets the tone of the game.