Then you should know that everybody is susceptible to DDOS attacks.
Which makes you saying its because of bad security point moot.
Jesus dude, talk about circular arguing...
Yes I do know every company with an online presence is subscepible to it. I also know the more money you spend in the area and the more attention you give it, the less susceptible you are. Sony are obviously not invested in this area and it shows, hence their security hardening is sub par.
I'm not making this a fanboy thing. I'd say the same thing about any other company with a big online service that was frequently brought down by ddos