I have to strongly disagree with this statement. I use (and test for accuracy) a wide variety of statistics packages. If you want raw data - use server logs (certainly not awstats or webalizer either, if you ask me!). If you want to monitor human activity, third party trackers are a better choice.
As for Indextools, I'm a big fan and I second Robert Charlton's comments. Thus far, they've struck a great balance between nice reports for everyone, but handy features (and masses of data) for power users like me.