These are just my experiences. I have other problems with Linux on the desktop too mainly relating to GPU stuff. Personally, while I love many aspects of Linux on the desktop and use my Linux VM all the time, I would say I still find the overall experience to be "just deplorable"
The giveaway was high memory usage by "dwm.exe"; it seemed to have enough memory pressure that unused windows would have their decor paged out, so switching between applications had to wait for a page fault to be serviced from disk.
Maybe take a youtube video that shows this?
Windows 7/8 has made all of these issues significantly better. If you are comparing XP to modern linux, its not much of a fair comparison to compare a 13+ year old OS to a modern one.