XYCat: For example i didn't care for assassin's creed much and played the first one just this year for the first time and it didn't get through to me much but i started to play the second one anyway and found out it changed a lot and it got really entertaining and fun.
Thanks for the recommendation. I might end up buying 2 at some point then. In the first I got annoyed by the game in that early mission of following someone. I just couldn't get it to work, and while I managed eventually and continued past it, that feeling of this being a chore meant I enjoyed the game less later.
As for the subject, I think it's just easier to play games you already know. You know you enjoyed them which makes the barrier to entry a lot lower. It's not a matter of old or new, just a matter of being familiar with it. When I get an old game I'm not familiar with, I actually find it a lot harder to get into than a new game I'm not familiar with. That's because the old games usually look bad or have harder to use controls. (Not to speak of compatibility problems, even with GOG games.)
Even when the game is the same as another, I'll pick the familiar one. I played the original NWN a couple of times through, but later starting with one of the expansions meant working on creating a higher level character, and it felt like too much work, so I didn't. In recent years I started playing NWN2, but also stopped when I died. Yet I'd probably still play NWN without problem. Similarly I will play Torment again, but I remember stopping playing the original Baldur's Gate early on, which means I'm less likely to try it again.
For me, I think it's mainly having less time and patience which makes the difference. When I was younger I didn't mind agonising for minutes or hours about getting through a part of a game. Now if I get to a problem I can't cross within like ten or twenty minutes, or get to a place where I need to replay the last ten or twenty minutes, I'm likely to not play again. With old games, I know I passed them, and there's even a chance I'll remember how, so the frustration element isn't there.