Or, you know, just buy the bundle right here
Also Dungeon Siege III for me. I tested the beta, and it just felt so overly complicated and non-welcoming.
The worst game experience I ever had was with a promotional copy of Law & Order: Criminal Intent. It was buggy as all hell and had occasional problems where the characters would 'stick' to the scenery, forcing you to reload a previous save game and hoping not to have it happen again.
I think the worst I've played is... probably Action 52. Thank the gaming gods I only emulated that. lol Thanks for the chance!
Honestly I haven't played too many awful games (that I remember at least. They might be blocked from memory) but I guess recently I tried Superbrothers: Sword & Sorcery Ep and that kinda sucked.
I'm not sure about worst game, but I had a lot of trouble with Twin Sector when I played it. The controls were a bit too hard for me to get used to, so I ended up messing things up a lot and it quickly got very frustrating. I was a bit disappointed, because the game sounded interesting.