Definitely no preorder, I’m not buying a cat in a bag for no real benefit. Kickstarter is a bit different because the game might not be made at all if you don’t back, but in that case I’ll definitely research the people involved to get a better picture on how reliable they are and if they really need Kickstarter-style funding in the first place.

For early access, I try to judge whether the current state of the game is already worth the price. Games like Minecraft or 7 Days To Die provided great value even before their 1.0 version.