I've had the 5.1 setup (the THX certified one, not the redesigned one that came after it) for over two years now, and have had 0 problems with it. I saw those reviews when I was considering buying it, and I suspect that the people who had problems were people who turned the bass up way higher than it was really meant to go (because a lot of them read something like "awesome bass...but died after 3 months"), so it's kind of their own damn fault. Respect your speakers, and their limits, and they'll be good to you. The sound quality is awesome, especially for the price.
No idea how you'd hook them to a PS2 though.