Q:

Which questions should we not answer?

Other SEs are discussing which questions are too general or easily answerable by google/wikipedia etc.
Example , Example, etc.
I was wondering the same thing about gaming. Someone had pointed this out about WoW earlier. And I agree that we should answer whenever we can improve the collective knowledge of the community.
But lately I have feel it is becoming more and more an interactive walk through place.
Basically, here are the things that I feel need more clarification

Solving puzzles, most of these can be found easily in walk throughs / youtube.
Stuff that can be answered as a direct link off to the wikia for that particular game. Esp. in regard to spoilers/stories, unless it is a clarification of a subtle point.

A:

I kind of agree with the flowchart posted in that blog post:

Notice the third question. Questions which aren't trivial, like solving puzzles, should be answered by us. Things I consider too trivial - and thus close-worthy - are questions such as 

When was game X released?
How many games did Blizzard release?
What CPU is inside the PS3?

i.e. things that don't require any thought and can't benefit from opinions, just dry data which is easily found elsewhere.
Even if something is presented in a well-known source, if the answer isn't trivial then it can indeed belong here. For example:

How much damage does the pistol inflict in TF2?

Seems simple enough, but with critical hit %, damage reduction by range, other server settings etc., the answer might be more complicated. These kind of stuff should be welcomed here, in my opinion.

A:

What is the harm in having these kind of questions?  Is there some negative effect to letting people ask them?  Because I think we get into a very slippery slope if we say that anything contained in a walkthrough is off-limits.  Personally, I never look at walk-throughs, because I don't want to risk learning a bunch of spoilers while I look for the one little piece of info I want.  

