The Witcher is one of those games that I get addicted to, play for hours each day and think about it in between, and then get bored of and put away for several weeks / months.
The introduction was decently fun. They spoon feed you just enough information to make the world of the Witchers mysterious and compelling. I was completely hooked for a while waiting to see what would happen next.
Then I got into Act 1. At first I ran around trying to get everything done, but I quickly got bored of the "go here, do this for me" attitude. I "quit" about half way through Act 1, and picked the game back up 3-4 months later. I muddled through the rest.
Once I got into Act 2, things got a lot more interesting again. Currently I'm something like 1/3 - 1/2 of the way through Act 2, and put the game down simply to play newer titles I've bought in the mean time. I need to pick it back up.
Overall, I wish they had done Act 1 a lot differently. I have a feeling a lot of people put the game down simply because they don't feel like running through that stupid village any more.