Metal Gear Solid 4 : I didn't play MGS4 nearly because of not knowing anything about the series; I got it because of lot of hype about its quality and loved it. I think it is the best or among the best on PS3.
Left 4 Dead : Never knew anything about it, got it on 360 one day randomly, one of the best mp co-operative game on the 360, so much fun.
Fallout : New Vegas : After playing fallout 3, I felt unhappy with the series. The whole game felt disappointing, the rpg elements didn't make sense, headshots didn't make sense, game felt difficult, story was stupid, gameplay was repetitive. After that experience most would never really purchase a sequel, especially if the sequel had reviews stating it is worse than the prequel or that only fans of fallout 3 would enjoy it. I found it for cheap and thought I should give it a try, after playing this gem, I went back to fallout 3 and played the way fallout games are supposed to be played; there is a certain way you have to play them to enjoy them. Fallout New Vegas's campaign is structured in such a way.
The Darkness : This was a random pickup too, just like left 4 dead and on 360 as well. One of the best fps stories and game overall on consoles.
Yakuza 3 : By the grace of the mighty demo, I found this piece of greatness. Fantastic game. I played the demo first time and didn't like it much at all. However for some reason I replayed the demo; instantly loving it.
