Originally Posted by Maylander 
the evil bad guy who's evil because he's evil, is getting very old.
Wlll, that's just an example of very poor character writing or characterization.
A good writer should always ask himself or herself : "
Why does he/she/it do that ? What are the motives ? Why is this entity there ?"
And, to be strict, this also must be applied to monsters living in a cave waiting to be slaughtered by some hero who wants experience points from them.
The "great" thing with action games actually is that these elements can be happily omitted: Nobody cares as long as the monster or villian drops 1337 stuff.
So, in fact, action games are "growing" a generation of game designers who don't learn to be good writers - because it is never required by their games.
Which - in the end result - will most likely lead into a decline of quality of games - at least story-wise.