I use that as an MS office replacement. I think OOo Draw may be a substitute for Adobe Illustrator, but I don't think there is anything in the Open Office suite to compare with Quark or InDesign for DTP tool.
I agree, free is good, open source is even better. If only I had a PC that I didn't need for a production machine or my wife's social life, I could run Linux. But I tend to break my installs, which makes actually producing something hard.