see, the bad acting didnt bother me in saw II.. it was the social interaction, the fact that they were all trapped in the house together & the story focused on how they dealt with it together.. thats what i enjoyed. reminded me of the Cube series-- bad acting, limited setting, focus on the characters interaction with eachother. it was cheesy & campy, in a good way.
i just watched saw 2 the other day, the only issue is its hard to get actors to perform great when all theyre doing the whole time is being scared for their life lol