Focus on the positive
In my experience, the things that Linux (word used in it's all-encompassing mode) does best are the things that it does differently from Windows. Take Office software - Open Office tries to copy MS Office and is just as big a PITA to use. On the other hand, look at installing software. Using software depositories in Linux is a joy, despite what the trolls say. Open the package manager, search for what you want to do, tick the package you want and your PC nips off, finds it, downloads it and installs it. No hunting round web sites, no registration, no nag screens, no unwanted extras installed that you then spend hours trying to remove. I could go on with similar examples of things done right in Linux (filesystem, updates, Compiz, scripting...), but I won't.
Basically, what I'm saying is, please don't make Linux like Windows to try to lure away people who don't really want to be lured. I moved away from Windows because I wanted something different. Give people a real alternative, let them see that it's better for themselves and let them migrate, if they want to.
And ignore the trolls. Come on - if Linux really was as bad as they say, no-one would use it, would they?