For me its a lot of things. The way they've taken the Dashboard, more towards a Windows Phone/8 style which I have never liked. Its all cluttered and full of advertising and hard to find what you are actually looking for.
The lack of exclusives coming to the console over the past few years and the ones that they do have I dont want anyway.
No interest in the Kinect, hate motion controls.
If the rumours are true then I dont want a set top box to take over entertainment in my room, my PC does all the stuff I need.
No way I am paying a subscription for online if its anything like Gold was. Playstation Plus has proven it can be done so much better.
We've had developers speaking out about MS and for Sony quite a bit the past few months, this has been saying a lot.
Sony just seems to suit my gaming tastes more.