Going all the way back there will be loads of titles. But in recent years...
- The Witcher. I tried, I really did, but by halfway through the third act I still wasn't having any damned fun, and I hated all the characters to boot.
- Torchlight. I didn't try quite so hard with this one.
- F1: 2010. This was the game I thought I wanted for years, being a huge F1 fan IRL. Turns out I was wrong, and I really do like powersliding when it comes to video games...
- Mount and Blade: Warband. I just didn't get it.
I think the trend here is that these were all games that would have taken a long, long time to "finish" (I don't think Mount and Blade even has a finish, per se) and in the end they all ended up feeling like work rather than fun.