I don't know the order that files should be burned for some of these ps2 games and was wondering if there is a method towards rebuilding the iso w/o knowledge of the order.
Well, if you've already got an ISO file, then open iso buster and select the iso image file, it'll show you the order.. same with an original dvd game too, use iso buster..
Or did you mean that all you have is the game files/folders and not an iso file? if so then when you extracted from the rar files you went a step too far, go into the folder where you have your rar files and look for one big file, usually between 1.5 and 4.3Gb, even if this shows as a rar file, it's not.. it's actually the iso file.. use DVD Decrypter in iso write mode and select that file as the source, burn onto good quality dvd media at 4x on 1x-8x certified media (half the max speed is a good rule)