Kwalish Kid said:
Again I must raise my concern that 4E is going to be really badly received because it demands imagination of gamers.
There's a big difference between imagination, which all RPGs require, and complete suspension of disbelief, which only more contrived rules require. Everyone who plays an RPG is using their imagination, whether it's imagining your character, the castle he's exploring, or the orcs he's fighting. Labeling anyone who is opposed to a rule in 4th edition as lacking or being opposed to imagination is not only condescending and rude, it's simply not true.
The previous poster nailed it. Some games start with imagination, fluff, story, drama and then translate those things into mechanics. The result are rules which are usually pretty well-founded in their universe. Since what characters can do is based upon drama and imagination, the resulting rules tend to be believable. Others always takes mechanics first, and often don't even bother to try to translate that into drama. The result is that what the characters do often makes little to no sense from a dramatic point of view. It's not about imagining it, it's about simply accepting that outcome whether or not it's believable. 4th edition, unfortunately, seems to have been born of the latter approach to game design.
And to those who say "magic isn't realistic, so nothing else has to be realistic either", this really is entirely missing the point. No, magic is not realistic, neither are orcs or elves. But those things can be believable, whether or not they are realistic. Realism and believability are two very different things. Many games go to great lengths to explain how and why magic works in their setting. It's often believable, even though it is obviously not real. And those are the magic systems I tend enjoy the most. In D&D, with the old vancian style magic, it was mechanics first, fluff last. The result was a magic system that left many who saw it thinking to themselves "I can't imagine that if magic were real it would work this way."
And the various explanations that they came up with over the life of the game were quite contrived. From 2nd edition's memorize and forget system to 3rd editions "partially cast in advance", stockpiled spells explanation, the whole system really felt artificial and, dare I say, lame. I think the lack of believability around vancian magic is perhaps the main reason it was so unpopular. From a mechanics standpoint, it worked great. It helped balance magic and provide alot of strategic elements to playing a spellcaster. But it just didn't make much sense. Ironically, 4th edition has largely eliminated vancian-style magic, but lost alot of believability in other areas.