I've just verified on saucy daily images that this seems to be work-aroundable 
by launching with user-data containing a boothook that will run ethtool -K eth0 
gso off.
example cloud-config:

#cloud-config
apt_update: true
apt_upgrade: true
packages: [ pastebinit ]
output: {all: '| tee -a /var/log/cloud-init-output.log'}
bootcmd:
 - [ ethtool, -K, eth0, gso, "off" ]

So far though, I'm 2 for 2 in reproducing bug 1201567 (300 second scsi
timeout before / is mounted RW), that results in a over 5 minutes before
instance is reachable.

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https://bugs.launchpad.net/bugs/1200243

Title:
  Network lock up Windows Azure/Hyper-V

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