Ok here's my take on it.
When it was just Sega and Nintendo, the "video game war" was almost playful and cordial compared to what it became once Sony showed up, waving its digital wang in everyone's face and spawning a culture of arrogance amongst its fanbase. Even after they completely dropped the ball on the PS2 having only 2 controller ports again (hell they even said "it'll have as many as gamers would think necessary" PROTIP: That answer wasn't two), people were still riding the Sony wave. And then at E3 2005 they declared the video game war to be over, which seems odd to me considering the fact that it's still going on now. I'll get back to the main crux in a moment.
Sony is a far bigger company than MS or Nintendo. Sony after all has Sony Music, Sony Pictures, and Sony everything else (computers, Playstations, car stereos, etc.). And wheras in some big companies certain divisions might be more civilized than the others, it seems (at least from a lot of news items) that Sony is all around a group of people who openly show contempt for the people who buy their products and made them so filthy rich in the first place.
Cases in point are as follows, some of them personal to me or people I know.
1. Sony Pictures used fake critics to give praising reviews to certain movies (such as "A Knight's Tale). I'm not saying that's never been done before, but just stick with me
2. A friend of mine's Sony VAIO laptop was on the fritz. She sent it in because the keyboard was warped and the power supply no longer working right. Rather than attempt to fix it like logical people, they instead said it couldn't be fixed due to water damage (a lie), and sent it back so that when she got it back, it actually no longer worked at all, instead immediately booting to a blue screen of death. That's right, they broke something and rather than own up to it blamed the user. Compare that to my experience with my first and only red ring of death from Microsoft. Not only did they fix it for me, but it was for FREE despite my not having a warranty on it. This was before the "free repairs for 2 years" thing was publicly instituted as well.
3. Sony BMG doing such wonderful things like bribing DJs. Also there was the time they had their CDs install spyware on people's computers, and then declared "it's nobody's business what that does". And of course now they've declared that ripping CDs you bought with your money onto your computer for your own listening is still theft and/or piracy.
4. Sony's latest two big gaffes regarding the PS3. I won't list everything because I don't think that's necessary, so I'll just focus on the Motion-sensing and the Rumble. First off, motion-sensing was just them blatantly trying to go "look! We're innovative too!" since Six-Axis didn't even exist in the PS3 until the Wii's Big Important Selling Point was introduced to the world; the Rumble thing was just another case of digital penis wagging. If you're having trouble getting the rights, just say so. Don't make up a reason that roughly boils down to "rumble is for suckas"
Ok and I would be remiss to point out SCEA president Jack Tretton saying that PS3s wouldn't be found on shelves at all and that he'd pay a $1200 bounty to anyone who could find one and then having that point immediately perforated by Penny Arcade. No business is perfect, I know this, but come on, this kind of behavior is juvenile at best and ridiculous at worst.
Now I liked the PS2, but after all this, I refuse to support Sony any further. Too much bad blood. Microsoft redeemed themselves for me, and Nintendo never did anything wrong to me personally unless we count them optioning out the Starfox series to a bunch of monkeys and fanfic writers with computers and not releasing any more of the "Mother" series stateside.