How much do you trust used games?

[Spiderbri]

Hey gang,

I have been trying to save money, by not buying any new video games till next year. I'm going over all the ones I have getting more trophies and such.

But I am falling so far behind, Brutal Legend, Uncharted 2, Dragon Age, Lego Rock Band, Borderlands are all out and getting good reviews.

I can get some of them for around $40 on Amazon used, and I haven't even checked Half.com yet. But the question is, obviously looking at ratings of sellers first, how much do you guys trust a used game?

now with Blu tech it is supposedly harder to damage discs than ever before. And if it comes with everything, case and instructions then it should be a no brainer right? I'm just still warry. I've gotten used ps2 games that worked but were glitched in some way, like Psychonauts where every cut scene had botched audio but the game played fine.

(and I know you have to be careful of things like Lego Rockband where the code to export would have been used so getting a preowned copy is not a smart move on that title if you want to export to RB2)

thoughts?