i always go about two thirds to three quarters of the way through a game, start playing something else for a while, then go back and finish the first. this gets worse around christmas and stuff when i get several games at the same time and want to play them all. i got an xbox 360 with CoD4, assassins creed, the orange box, and bioshock for christmas. i have only beaten portal so far, and thats cuz its so short (but absolutely epic). i havent even started half life two because i want to beat half life one first, and i dont even own a copy of that because im pretty much exclusively a console gamer. back on topic, i usually try to finish the games i play at some point, unless they are a rental i dont feel like rerenting, or they are just that bad. besides the stuff that i listed, i cant think of anything else i have that i havent finished but im sure i have some. oh and with games that have the main ending and good ending thing, like mario games, i consider it beat if i only get any ending. 100% completion is rarely worth it.