Found these in TheBouncyPherret's signature:
I may not be smarter than a 5th grader, but I'm sure I could kick his ass
-Mike Merles, D&D Podcast Ep. 17; ~21:40
As far as I know the roles are pretty ironclad. The leader will make decisions for the party. The defender will speak up if another party member gets insulted in a tavern. The striker will be primarily responsible for scoring goals. And the controller will monitor air traffic conditions. Says so right in the DMG.
To me, there's nothing in HP and HP recovery that implies that you are always dodging until the final blow. Sometimes a blow pounds you into the dirt and leaves you looking like burger. Sometimes, you're just too Bruce Willis to care.
Seriously, though, how much fun would it be to read these boards if everyone behaved reasonably?
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Common Sense shoots! Rules goes for the block... and misses! Common Sense scores!
That's an easy fix: Your DM politely reminds the player who's running the game, and every time the player starts running his mouth, his character takes d6 + Annoyance modifier damage.
I'm not used to people asking smart questions in Rules Q&A...