The question really isn't answerable, but I'll give you my subjective, un-scientific thoughts: It depends on who is playing--both the general level of the palyers and the difference in strength. If I play a pro in an even game and lose by 50 points, I would call that a well-fought game for me. If I'm playing someone around my strength or with proper handicap, I'd say around standard komi (6.5 ish) is a fairly close game (at pro level, that is a "wipeout"). For DDKs, 15-20 points in an evenly-match game is still not a complete blowout. (This is all based on 19x19 games, by the way.)
But these are just generalities--I depends on a lot of factors, I think, including how the game goes.