As much as you feel the same about Java and Hudson... what about Virtual Box. All of them are Oracle now and Virtual Box is pretty good?
It really isn't. VirtualBox was always mediocre compared to VMWare, and ever since the Oracle acquisition, I haven't heard of any major new features or performance improvements coming out of the VirtualBox team. Though, given what Oracle has done to its other acquisitions, benign neglect is a pretty good outcome.
If you want to see the "major new features" implemented, you need look no further than the changelog. [0]
And FWIW, I've tried VMWare Workstation several times and even own a copy of it, but VirtualBox has been and continues to be the most reliable, simple method of virtualization for me (and several of my colleagues). The VMWare drivers/tools are frequently broken by kernel upgrades, the interface is clunkier and more demanding (including requiring hosts to run a couple of background daemons; VBox operates fine on hosts with just the drivers installed), and the performance, while better in some areas, is much worse in others, making it a wash for general use.