My biggest gaming regret is all of the games I have yet to finish. I have a tendency to play a game, but then get excited by the next cool game and never finish the previous game. Do you know how many worlds I've left un-saved? It's a tragedy!
Seriously though, it's a terrible habit of mine to have the best of intentions, but then get side-tracked, so I think this is just a reflection of that. But I keep telling myself "one day".