What was your least favorite game? Why is it your least favorite game and did you have a particularly bad experience, getting stuck etc.
Mine is Diablo II...
For me, it's Diablo III. I hated not being able to choose the stats and skills I wanted to enhance, so basically the times when I completed Diablo II as a barbarian, and then again as a barbarian with a completely different skill set were gone.
I hated always being online. As I do with Pokémon, I played Diablo II exclusively in single player. With Diablo III, I still wanted to play alone, but now I had all the drawbacks of online play without even wanting to be online: lag, not being able to play when my internet connection was down or when I was downloading something big at the same time, or (and that's the part I find absolutely ridiculous and shameful) returning from a bathroom break only to find out that I was kicked out of the game for not doing anything for like two minutes. Kicked out of the game I was playing alone!
And then I found out that my character was on an American server, because Diablo III did not detect I was in Europe on first launch. Not only it explained some of the lag I was having even while doing nothing else with my internet connection, it also explained why I couldn't see my coworkers online (for a few weeks, everyone in my job got into Diablo III) . I lurked on the Blizzard support forum and found a massive thread where people in the same situation asked Blizzard if they could allow us to move our characters from one server to another. Their answer basically amounted to "No. Because... because no" .
I thought the story was underwhelming. I have nothing to say about the graphics or music.
And then I discovered Torchlight. Torchlight I. Not Torchlight II, mind you, but the rather minimalistic first game was enough to fill the void Diablo III could not fill.