I am completely obsessed with this series. I'm continuously blown away by how they improve on the series with each game. I recently finished Brotherhood and am now working on getting 100% synchronization. But a friend of mine visits and she plays AC:1 and I still enjoy watching it. Admittedly, the first game had a number of flaws, but it just makes me appreciate the improvements even more.
And now Revelations is the last one. I've been so very tempted to pre-order, but I just need to remind myself that I won't be anywhere near my Xbox when the game comes out.
EDIT: I figured what was up, I just needed to update Flash. Here are the literal trailers in all their glory.