Marketing surveys suffer from remarkably selective attention; sort of like asking "When did you stop beating your wife?" reveals a certain prejudice.
Instead of noticing that we loathe any and all of the ads, they are going to ask: "Which one did you enjoy the most?"
Well, of course. Marketing companies don't want to be unmarketable themselves. Being selective about their questions allows marketers to make their customers think they're really liked, instead of disappointing them with the truth.
You're thinking of 'deus ex machina', which is a plot device along the lines of "and suddenly a god-like being appeared and fixed everything"...
You mean Q? Not only did he fix everything, he even caused everything.
It depends on what sort of potential "adjustment" we'd be talking about. A lot of video games allow you to adjust the difficulty, but most of the time this simply means an increase in stats that makes it easier for the same old AI to kill you and harder for you to kill it.
What a lot of video games DON'T seem to have is an adjustment in AI. I don't know how many games (RPGs in particular) where it simply seems like the enemy is wailing on my characters at random, rather than attempting to *gasp* strategically isolate one character, kill them, and then move down the line! If they see you use healing magic, then why can't they realize that they should mute - or eliminate - the mage(s) first?
Other posts above have mentioned that we'd like to be rewarded sometimes for our increased skill in a game - so accordingly, I'd agree that not all enemies should be able to adjust as much as others. At the same time, what would really make a game more interesting is if a zone change resulted in a more strategic AI to combat, rather than just a simple stat increase.
Start off a game with a few areas (or dungeons) that allow you to comprehend the game mechanics and get strategies. Then, allow the enemies to understand the mechanics and those same strategies, rather than just adding a status ailment or two and increased stats to their armament, and allow there to be a semblance of intelligence to what we're fighting.
The flush toilet is the basis of Western civilization. -- Alan Coult