Yep, I think a lot of people were shocked that the new and improved px, (now known as Team Curse) who were the superior team at IPL5, were beaten by SK. It is contrary to most people's analysis - that Curse's relatively inexperienced lan-goers would perform better online than at a live event, but this wasn't true after all.
A game can be super original and not fun at all simultaneously. Natural Selection 2 mastered this concept.
Oh man I couldn't disagree more. NS2 is very original, thats a given, but the beauty if it is just how exciting the game can be, and how well it manages to repackage some of the tension we experienced in movies like Alien/Aliens.
While DayZ wasn't the most polished game, I think its popularity and innovation could have got it some consideration for this list. In 2012, a new genre was born thanks to DayZ!
Regarding games that should have really be considered and probably made this list, I would have to say Dishonored.
Games that shouldn't have made this list: Tribes and NS2. Tribes was innovative, but not really that fun except for a small amount of people. I loved NS2 and it was extremely original, but I wouldn't place it over Dishonored or Halo 4.
You're probably right about DayZ. Its not my cup of tea, but the fact that it was probably THE game of 2012 should have earned it a spot on the list. Noting NS2 for its originality and then placing halo 4 above it is kind of silly imo. ;)