3. The Games Reward You For Being Pure Good Or Pure Evil (Thereby Punishing You If You're Anything Else)
Developers really like their extremities, don't they? Not only do they give options in absolutes (and don't forget, only a Sith deals in absolutes), but they almost always give away some sweet special power or bonus attributes if you pick one side at the beginning of the game and then go all the way on that side. A good example is the Karmic Overload in InFamous. That basically takes out the role-playing aspect and the decision-making part of the decision-making gameplay mechanic, reducing it to a simple question of "Which side are you on?". That is, as long as you want to maximalize the power of your character, but who wouldn't want that anyway?
Ready to unleash electric Armageddon with the power of kindness
This can be defended, of course. It's not like your character will lose some of their power if they don't max out the Good or Evil spectrum. It's just a little reward for those who go beyond the call of duty, becoming the reborn Jesus Christ or Satan himself, respectively. But the point is: by rewarding them for doing the same Good/Evil options over and over again instead of thinking for themselves, they punish everyone else. Making my own decisions is awesome and all, but when I think about the +3 Dexterity my Sith Assassin could get for free if only I killed everyone the game lets me kill (even those I don't want to), and were mean to everyone in my group (even to those I really like) then my sense of justice and fair play overrules my judgement. I MUST get that free bonus at all costs because others got it, and I don't like being left out. And forcing me into this dilemma every time I play Knights of The Old Republic II: The Sith Lords gets Obsidian a shitload of Dark Side Points in my book. Speaking of sequels...