Balesir
Adventurer
Of course it can be fun, and of course there is a place for such play in the "broad church" of "roleplaying gaming". Playing in a world rather than a ruleset is a style of play I really enjoy from time to time.I respectfully disagree when people say that the only skill that should be considered to play D&D is to know the system and his own character sheet.
Out of the box ideas are always welcome on my table. Creative parties are always better rewarded on my games.
In fact, we used to play a lot of games using no sheet, no books. The things your character could do were the things "you" could do. Dices were used only when some action was in doubt (has the door broken or not?).
And it was a hell of a fun.
But I would question whether such play is "playing D&D". You are not using the rules of D&D - you are using a selection of other rules that you are inventing on the spot to suit the world situation you are imagining. There is certainly nothing wrong with this, but I don't consider it to be the same thing as "playing D&D", which is done using the rules of D&D. I do, on the other hand, considr it to be "roleplaying gaming".
I realise some people think of "playing D&D" and "playing a roleplaying game" as synonymous - I can tolerate that view, but since it removes a large chunk of what "playing D&D" means (without replacing it with a useful alternative) I much prefer to keep to my own definitions.
On top of this, I think that having a complete set of rules in any RPG is preferable to having only a partial set. Having a set that explicitly calls out player abilities in some sort of semi-related sub-game would count, but would not fit well with the ethos of D&D as I view it.
More clearly stated, perhaps, I am happy with a game like Hârn, where the world is deeply developed and described, having rules that amount to "use game world logic to resolve in-game actions", but for more world-generic and challenge-focussed systems such as D&D I want the rules to be game rules, not vague injunctions to make stuff up as seems appropriate.