GSHamster said:In contrast, D&D is a position-based game with collision detection. A monster attacks the fighter instead of the wizard because the fighter is between the monster and the wizard.
Actually, that isn't the case at all. Say a fighter and a wizard are being threatened by an orc. In real life (assuming that wizards and orcs existed in real life, of course), the orc would advance on the wizard and the fighter would step in between them - simple enough.
But in D&D, if the orc wins initiative, he simply charges the wizard and takes a big chunk out of him with his axe. There is nothing the fighter can do until his turn comes up. And, depending on the positions on the battlefield, even if the fighter wins initiative, the orc may be able to get around him to attack the wizard without taking an AoO.
I really hope this is something that 4E addresses, especially given their plan to make combat more mobile.