The rootkit fiasco I will give you, however as mentioned, when Sony Japan heard what BMG had been up to I gather they were just as pissed off as you, prompting the very public U-Turn on it. Not 100% sure I can blame them for trying to protect their business at a time when Torrents were exploding in popularity - in fact I would worry more about a company that DIDN'T take steps - however the path BMG chose sucked balls, and they were rightly admonished for that. But that was 10 years ago, and time moves on. Judging by the list of affected titles, I'd say that for buying some of the CD's in question you deserve everything you get :)
The Other OS thing is a complete non-issue imo - the only time I ever hear it mentioned is on these boards, and the number of people using that feature was infinitesimally small. iirc it was also a fairly terrible Linux box, with no GFX acceleration and only one core of the Cell available. However, I lay the blame for that one firmly at Mr Hotz's door for trying to crack the PS3 in the first place - again I'd be more worried if Sony didn't try and close the door.
As an aside - given how long it took to crack the PS3, maybe the team who designed the PS3 should have done Sony's IT security as well? Not like they could have done a worse job now is it...
The proprietary thing never bothered me TOO much, as technically they were often better solutions, but thankfully for all concerned they have moved away from this model now - only proprietary tech I can think of now is the PS Vita memory card, for everything else they use industry standards (microSD, microUSB, DLNA, etc etc). I've got a 2014 Bravia at home, and the other manufacturer's kit it won't play nicely with is Apple, however that's a whole other discussion about proprietary standards.
Like them or loathe them, they still make some bloody good kit (TV's, Consoles, Mobile Devices, the high end audio equipment, cameras and sensors, etc etc), and they are one of the few remaining electronics companies that still know what innovation means (even if for every great idea they have 3 silly ones - Tablet P I'm looking in your direction here), and it would be a shame to lose them because some angry geeks (the hackers, not you) have sand in their vaginas about something.