Grand Theft Auto and Mass Effect and that's pretty much it. Most game series I tend to skip one or two entries because they just don't interest me or veer too far from the originals or just plain suck. For example, I love the Assassin's Creed games but I skipped Revelations because I was burned out on the series, was sick of Ezio and just didn't feel like paying 60 bucks for what looked to be an expansion pack. I just watched TheMediaCows play it instead. They had funny commentary, I didn't have to pay anything and I still got the story.
http://www.youtube.com/watch?v=UIbu3wJDmVQ - New gaming series My podcast: hulkshare.com/inferiorminds