I agree about filing the bug reports under https://bugreport.apple.com
Aside from calling AppleCare after you install OS X Mavericks Server and getting help during your 90 days after purchase, filing a bug report is about the ONLY way to notify Apple of bugs. The forums are not the place to report to Apple.
While I agree that Apple introduced a new implementation of SMB2 and it is supposed to be more reliable, notice that 10.9.2 just included fixes for SMB2 reliability. How long has AFP been around vs SMB2. I think that should speak to what's more reliable. Going forward, I would expect eventually SMB2 will be a good choice.
Just got this note from Apple through the Bug Reporter:
We believe this issue has been addressed in OS X Yosemite. Please test with this release, and update this report with your results.
OS X Yosemite GM (Build 14A389)
Download from the Mac App Store
Please let us know if that resolves the issue for you by updating your bug report.
Hopefully that's good news. Although is anyone actually brave enough to put OS X Yosemite on their server yet?
fI ordered a new Mac Mini to replace our aging XServe which won't accept anything newer than Lion.
It will almost necessarily have to run Yosemite. I'm hoping that my network home folder problems go away with Yosemite. I'll return to give an update after the new server arrives and I'm able to migrate or rebuild everything. And I'll definitely be contacting Apple to let them know if there are problems. I plan to make good use of the 90 days, too.