Lol, I call the second one a completionist which is what I am, of course I will play crappy games, but not just for a few points, I will finish them and get the full 1000.
I think both have their ups and downs. Sometimes I hate being a completionist in the fact that I will play a crappy game and finish it just because it bothers me not to have done so. So I can't pick up a game play it for an hour get 20 achievement points and quit because its bad. I have to finish it all the freaking way because I'm stuck. So I would say its only good to be a completionist if you play mostly good games and check out the games before you buy them. A GS whore can play the game until they don't feel like it anymore and move on to the next one, but then of course should you really be proud of only easy achievements?