This may be a bit nitpicky, but today I was using a mac at school and I was looking at the rounded corners of the windows. What struck me was how they were extremely jagged looking. I had read an article a while back that essentially looked at this same issue on windows, which is admittedly much worse. Still, it is pretty ugly if you ask me. I guess that is why I use Linux!
And for any Microsoft recruiter that happens to take a look at my blog, this doesn't mean I dislike windows. I just enjoy working with Linux on my desktop (in other words I still dual boot ;).