Also, when I had faction-switched before that, I had to go from being a tauren to being a night elf. It was a considerable downgrade.
Regarding mechanics, the speed boost is very nice, and 1% crit is really nice for the DPS specs (not bad for the others either, just not as good as for DPS). If I was rolling up a new druid that I intended to always tank, I'd consider making a night elf (assuming they still get the 2% hit reduction...is that still there?), but otherwise it would be a worgen.
Actually, I do have an alt druid, and it is a worgen. It's for gathering, and nothing beats a worgen druid for herbalism/skinning except perhaps a tauren druid (fast skinning versus fast herbalism).
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