Persona 4 Golden - It was so amazing and it took me months to finish. I'm addicted to all its spin offs and it's got me into P3P too!
The Sims 2/3 - The day I realised that I could make my sims universe one of pain and suffering caused me to play it a lot more. Even now I have a town where there is one woman who has the task of having 100 babies with all the men in the town! My town is now subsequently inhabited by these spawns of satan who terrorise and woohoo everything... Oh how I love the Sims...
Danganronpa 2 - I couldn't put it down, the concept was so cool, funky and groesome. I love it. Better than the first in my opinion.
Mass Efeect 2 - One of my favourite games of all time, I loved flying around the Galaxy with my alien squad and saving the universe. I played it through from 1 - 3 about five times and I love it. (But that ending... Ugh)
Skyrim - Dragons rule! I've spent probably 100+ hours on that game.
Portal 2 - It was so puzzling, but fun and quirky. I loved GLaDOS she made the entire game for me.