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Any actual reasons behind that defamatory slam or just blowing smoke at a great project?

Well, I tried it and the botom line it did not work. Let me ask you this have you tried it before advocating.

Let me be clear here, I try almost anything related to new OS's before speaking up. Re XEN , I tried FC4 i386 version with XEN 3.0. The stock kernel worked fine however with XEN kernel one of these 3 things happened

1. The machine froze on me
2. The network connection died ( I need to surf to look for help on how to run XEN)
3. The Domain 1 refused to start no matter what I did

Next I tried the Suse 10 implementation and it was a better implementation since my machine didn't hang that much. But again I found that I was unable to start the Domain 1.
Frustrated I tried the live CD on XEN's website, which basically ran fine except the Keyboard stopped working. I tried passing nosmp i8042.nomux and all sorts of kernel options bu to no avail.
After getting frustrated I tried the eval version of ESX Server which needed two physical machnies. Since It left you with a Console Windows. My final choice was VMWARE GSX Server which was headless like XEN. And it works on my minimal FC4 for i386.

The advantages that XEN is proposing is lost in the stability/usability issues. Also the support in respect of message boards and forums are limited. And whatever little exists in terms of users interaction talks about high end servers.

> I try almost anything related to new OS's before

Sure, just checking: Xen 3.0 changes the Xen 2.0 architecture to move more hardware support stuff out into Linux itself. This is probably why the LiveCD didn't work for you - last time I checked it was based on 2.0.

The original FC4 Xen rpms were a bit dodgy - basically just a snapshot of the development tree at a relatively early time when it was still quite unstable. I generally recommend that people avoid them, although I think they might have been updated subsequently.

SuSE 10 is a rather more recent snapshot and seems to work pretty well for a load of people. What was your problem starting a domU? If the machine runs stably in dom0, getting the domU running *should* (in theory) just be a configuration issue.

It sounds like you've had a fairly unlucky experience. Where did you try for support? I don't imagine there are many Xen people on distro forums, etc. Support on the Xen mailing lists is generally fast and good for most people as long as they post enough information. If you ever try Xen in future, you might want to post there in preference to other forums.