Just a minor point: out of the box, neither Windows nor Linux include Java at all, so this is a pretty dumb complaint. To install Java on Linux typically requires you to enable "non-free" repos in your package manager, which many people don't like to do (and the GPL Java hasn't trickled all the way through yet). It's true that OS X Java releases trail Sun's releases by a bit, but count your blessings - it used to be a good 18 months behind in OS 9, and at least it includes something reasonably modern out of the box, unlike anything else (except possibly Solaris?).