Obryn
Hero
Yep. I said it above, and UltimaGabe says it here.The Fighter's Mark is the same way. In NO WAY WHATSOEVER is it a compulsion, magical or otherwise. It tells the Marked foe, "If I attack the Rogue, I take a penalty to hit and may get whacked. If I attack the Fighter, I don't get a penalty OR get whacked, but I don't get to attack the person I want to attack." It's 100% a choice. It's up to the DM whether he follows the mark or not- it's always a tactical decision. Sometimes the penalty of ignoring a mark are worth taking, sometimes they're not.
A mark isn't about an enemy being afraid of a fighter, feeling aggression towards the fighter, or getting tricked into attacking the fighter. It's all about the fighter being damn good at messing up enemies' attacks, and about taking the opportunity to mess up an opponent who isn't focused on them.
It's not a CRPG "aggro" mechanic, because there's a living DM behind the screen analyzing tactical choices. It gives incentives for enemies to act a certain way, by imposing consequences for doing otherwise. It doesn't force the monster to fear or hate the fighter.
It's not about the mark. It's about the fighter.
-O