The concept appears very interesting. I've yet to see an actual game in the steampunk world. Assassin's Creed can loosely qualify for the Leonardo creations, but that isn't steam so I don't think it would make the category in full.
Leonardo creations = Clockpunk/Gearpunk, which pre dates steampunk throughout the timeline. (1600-1850) Though each previous age does have an affect on the next, hence steampunk still uses many of the same visual cues such as gears, cogs, simple turbines etc.
ps i prefer AC1. AC2 was just as good, but u cant beat the good ol middle east. AC3 seems a little over the top.
High five on that, man. I stopped playing Call of Duty online after it was no longer a game but more of a "what gun will you get shot with this time that will kill you in one hit from a place you can't see?" I think maybe the message there is that reality stinks.