Sony is right, though you have to look beyond the most recent events to see that. I think the PS-2 succeeded because it had a good mix of generes on the system, as opposed to just focusing on lowest common human denominator shooter games. The PS-2 was pretty much the go-to system for things like RPGs and Survival Horror.
Microsoft seemed to be beating the PS-3 at it's own game with the 360 to begin with. When things like "Lost Odyssey" came out it was pretty much beating the RPG drum where Sony had very little on the market except for a few shooters like "Resistance". I say this as someone who owns both consoles.
As time goes on however and Sony seems to be picking up in the long term (as they said they would) you see the same niches beginning to return. Sony has seen the release of a number of decent, niche RPGs like "Cross Edge", and "Trinity Universe" without any 360 equivilents (despite some early plans). They also have the upcoming "DC Universe Online" and "Free Realms" products, where Microsoft has yet to be able to get an MMORPG off the ground largely due to their unwillingness to work with MMORPG developers to make it viable.
In comparison, it seems that Microsoft's new big titles, or upcoming ones, are indeed all shooters. "Modern Warfare: Black Ops", and "Halo: Reach" for example.
As more of these "secret projects" developers are working on are revealed, we'll see if this remains true, but right now it does seem like this is how things are playing out for the moment.
Honestly, I think what might be turning the tide here is these upcoming MMORPGs. Console players have wanted some for a long time, and pretty much all of the MMORPGs planned for release (especially on the 360) wound up getting deep sixed horribly. If Microsoft continues with it's current plan, and Sony seizes the console MMO market, that's probably going to doom Microsoft even into the beginning of a new hardware generation if we wind up with MMO addicts sticking with the PS-3 for the next five years or so (expansions allowing) just for that. Once the chips are down, simply coming up with competing MMOs isn't going to work out too well either, as many people can tell you, things like WoW, or Everquest Before it, become juggernauts because once invested due to the time involved few people are willing to run off to the newest, slightly prettier collection of flashing lights at the drop of a hat. Even if they do, most ultimatly wind up coming back to their drug... errr MMO, of choice after a bit of flirtation.
