AbdulAlhazred
Legend
i don't know much about real world disarming with swords. But I dont this this is the sort of thing disarm is attempting to model. It might even be a bad or unrealistic rule. However it isnt a big problem because no one really associates the disarm with the character choosing between taking damage and being disarmed. This is in fact the first I have ever heard about disarms involving such a choice. Come and get it creates a problem I just cant get around. I think it is fair to say there is a big difference between physically forcing a weapon out of a person's hand and forcing them to choose to walk over to you. It is also choice operating on a much smaller scale than physically moving on the battlefield from point A to point B. that is the sort of choice gamers expect to be in the hands of the person playing the character. Movement is something you normally have control over in the game.
Well, lets see:
1) CaGI is virtually the only power that is like this, aside from charm type magic which presumably isn't an issue. So the question that I would have is is it really a good argument against an ENTIRE GAME? CaGI is about 1/4000th of power offerings of 4e, and even counting its higher level follow-ons they total about 1/800th of the power offerings of the game. Simply ban the power or let the DM decide if and how it actually works (which is always within his rights to do).
2) As I said above, magic has a pass on this, so it is NOT TRUE that "movement is something you normally have control over in the game" unless there don't happen to be any casters around, because if there are you'll be lucky to move where you want at all if you're an NPC (or a PC facing some serious caster enemies).
3) CaGI operates entirely on NPCs. Its possible a monster could have basically the same power, but I don't know of any that do quite the same thing. It seems to me that it is MUCH less true that the DM's characters are under his control at all times in the sense you're talking about. In pre-4e D&D charms, suggestions, holds, uncontrollable dancing and laughter, etc were part and parcel of the effects NPCs regularly got dished out to them. A PC with something like a Rod of Rulership or a Helm of Brilliance could expect to virtually dictate the actions of everything in sight range if he wanted to.
Put in that context I'm not sure why anyone wants to make a big deal out of CaGI. Obviously it DOES bother some people, but it is incredibly trivial to just not pick it (if it bothers you as a player) or to ban it or nerf it as a DM.