While true, I was specifically speaking more in the realm of consumer level applications, sorry for not making that distinction clear. There are even exceptions in that arena, certainly, but many popular open source applications still leave a lot to be desired. GIMP is another major example that comes to mind, as well as many of the open source media players are majorly lacking in some way or another. They tend to have one really must-have like feature but have a major fault. Which is really not surprising considering the background that many of these projects form from. I guess I like to experiment with open source software but always find myself going back to closed source applications to get something actually done.
I agree on GIMP. It's ok but definitely not up to Photoshop standards. As for media players, that's completely not true. I use mplayer and can play more media file formats than Windows Media Player. Try playing a Ogg or mkv file with WMP.