I'm not picky, st least I don't think so. I just want the DE not to get in my way.
Unwanted popups, slow and "fancy" effects that makes your workflow slower, weird default behavior (like alt-tab with gnome), multiple clicks to do what you used to do with 1, etc.
I don't think that's being picky, it's just wanting something that works and doesn't infuriate you with every new update.