Ah well, I have issues with all the major OSs.

I was surprised after I installed Windows 8 (64 pro or business or whatever it's called), and found Firefox and Chrome to both be 32bit, haven't checked Internet Explorer yet. Now I'm not sure if it even that is even an issue or not? It bugged me anyway.

I've been running a 64bit Linux OS for years now, and the most irritating thing about it was Flash plugin support. Some people deem an OS that can't play iPlayer or some such, as unusable. Anyway flash support is reasonable for me under Chrome these days (didn't Adobe say they'd abandon 64bit support on Linux?)

The missus has Windows 8 on her lappy, and both Chrome and Firefox frequently crap out, she has just gotten used to it.