I believe Sony started out early with a message of, "We are Sony, bow to our power and BE BLOWN AWAY!" The message was to show POWER. It was supposed to work, but didn't. The Octopus one is pretty good though. It is still, SONY = POWER. It does show the games in the process. The Playstation Network one after that one is pretty good, but maybe a bit too late. If you happen to be the top console, and then remind people you are, and do it as it is fun and sociable, it can work. You are the safe choice.
The problem with Sony is that they had been the leader, so they can't come off as being the choice of a rebel and underdog. It is a tough spot for them to be in. And they can't do, "We are Sony and Playstation is here", because the other two have outsold it and are viable choices. And they can't compete on price, and they can't compete on a new way to play either.
Anyone have any idea on what they can run as an effective ad that makes the PS3 compelling, outside of showing some exclusive games, and hoping they catch on?