I'm the worst type of gamer. When I'm playing you'd best give me a 25 foot bubble of space. I don't get the time to play I'd like, but when I'm hooked up leave me the H*ll alone !!!!! There is nothing more irritating than the wife saying " can you go check the mailbox" when I'm fighting a boss character and she's simply playing POGO games. When I game I'm in all the way, distractions tick me off something severe.
As for finishing my games, I usually don't. I have around 90 PS2 titles and except for 2 none are done 100%. Most are around 75-90% done, but after the initial groove rusts and a new game comes out I move on. I will ( theoretically ) finish them eventually, but I do tend to loose interest quickly.
Also my time frame is limited so I hate trying to go back into a game I'm stuck on when I only have 1 hour to work on it. Seems like beating a dead horse to me.