Is Raiden In Assassin's Creed: Brotherhood Worth It?

This is old news, but the video looks new. Raiden from Metal Gear Solid Rising is a playable character in Assassin's Creed: Brotherhood. Do you have him yet?

Raiden becomes playable when you score a bronze or better in all of the game’s virtual training missions. In case you forgot about him Ubisoft released this Raiden teaser earlier today.

How many of you have unlocked Raiden? What do you think of him? Should more games cross-pollinate like this? Or does it all seem a little silly to you?