Well, "fanboy rants" are not always wrong, and I think this is an example where they have been right on the money, and even having some of the people "in power" within the industry agreeing with them.
As someone who has both systems I can say flat out that the 360 is not as powerful a machine as the PS-3 without any kind of fanboyism involved. Indeed we've known this from the beginning, and things like Sony's control over the Blu-Ray format were going to be a big deal.
From the beginning the developer attitude seems to be that the PS-3 is more powerful, and can do far more, but is VERY difficult to develop for compared to the 360 or the PS-2. What's more game producers increasingly want multi-platform releases as opposed to products exclusive to one console or the other. The console producers themselves are also far less willing to actually pay money to developers for exclusive products than in previous years, it happens, but we see far less of it. In general today your more likely to see a console company pushing for exclusive content for games, rather than exclusive games.
Microsoft's policy is that if someone develops a product for another more powerful console, like the PS-3 that fully exploits what it can do, it will not accept a 360 version of the same game that clearly isn't a good due to the lower spects on the system and the fact that it can't be pushed as far. A game that fully takes advantage of Sony's Blu ray, needs to give up chances of being a multi-platform release because Microsoft will not allow a cut down version for their system designed to work with it's inferior discs.
This policy DOES mean that Microsoft is effectively negating their competition's tech advantage due to the desire of the industry to release everything multi-platform. The Microsoft policy is pretty much "if you fully exploit the PS-3's greater capabilities expect to lose our user base" which does gimp high end game developement since game developers are limiting themselves to the lower technology.
Bad for games, good for Microsoft's bottom line. Of course game companies are just as much to blame because they won't buck the current system. It's no longer about making good games (despite what they might say), but about making as much money as possible. All hype aside they will go for the biggest possible market and profit, rather than trying to make the best possible games. After all, why make say 30 million dollars in profit by making the best possible game you can for the best console technology, when you can produce a crummier game more easily and make say 70 million dollars by selling to a larger audience? Some would say "that's business" and they would be correct, on the other hand I'm the guy who will say that this represents the problem with the industry and what is holding gaming back, I figure when you've already got 30 million dollars in profit coming in it's ridiculous to sacrifice the integrity of the product and the industry to chase more money. Capitalism is a wonderful thing but the problem is that a few greedy bastards wind up ruining it for everyone by not being able to reign themselves in and decide they have enough. Every single industry that gets big winds up falling into the same trap, stops caring about the product or it's actual integrity and advancement, and turning everything into crap.