I have to if I want to play anything these days, but that actually means I don't. I got Arkham City installed but I can't bother to play it.
The situation for me happens at all because there is nothing new to play, and I end up playing something like that I got for cheap and I tried to get through it, but can't. I find it hard to get through anything anymore. My type of games, from smart FPS to adventure-action games the likes of Zelda & Metroid, to any semi-open game thats filled instead of huge and shallow, they just don't exist anymore.
I always play games I own until I feel I've completed and understood them. I revisit old games if I feel that I missed something significant. At the moment the only exceptions to this are Diablo 3 (HC would take too much time and dedication) and Witcher 2.
I don't think I have 100% achievements done in any game though as they are often very uninteresting and completing them doesn't seem important in understanding the games.
I used to . When I had more time on my hands, I would just finish them even if I did not love the game. Now that I do not have the time to play every game, I am forced to be more selective. It is a waste playing a game I do not really enjoy, and as a result not having the time to play the games that I really would.
I5 3570 | GTX 760 | FILCO Majestouch 2 tenkeyless | Zowie FK | Asus Xonar DGX | Kingston 120 GB SSD | Sennheiser HD 518 | Samsung S24A350H
Too many good games out there to waste your precious time with ones that don't interest you. I spent my whole videogame realated childhood this way. Now that I am older I pick and choose carefully despite the reviews and critical acclaim. Yet I still find my old habits die hard. I forced hours of gameplay in Mass Effect 2 only to realize it was just a corridor duck and cover shooter, which is a shame, because I enjoyed the first so much more.
I play what I want, when I want, for how long I want, and if I don't want it anymore, I go do something else.
I may play a game halfway through and then stop.... then maybe 2 years later I'll be like "I wonder where I left off?" and as long as I still have my saves (or if steam cloud has a save) then I can jump right back in...not that I'm trying to completely finish the game or anything as much as just playing what I feel like.
As an example: I haven't finished Hard Reset yet but I started playing it again... I started over though because I forgot almost everything about it. I may not finish it... I may drop it again. I May start it over again.... I'm not worrying about it either way. If I'm ready to play it, I'll play it.
never 100% if it requires a lot of extra stuff to do in a game but most of the time the game will have enough quality in it for me to go through it t finish. I am guilty of using game trainers to just run through games with no skill involved just to beat games as fast as possible though.