completely depends on the seller. If it's a pinsider with a high rating, I'll usually take their word. If it's a stranger, I'm hesitant. I don't know how many times I wished I would have inspected more when I find more issues after I've gotten it home. Even if pointing out the other flaws didn't lower the price, I'd want that person to know all the things that were wrong with it.

I'd say the best thing you can do before picking up any title is to watch a really good gameplay video, maybe a papa video. Make sure you know what it's supposed to do (this is how you get multiball, these are the lights that should be going off in this mode, etc).