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The Lean Startup way suggest releasing a project early even when the first release has problems. I don't think there's a problem with LW2.0 being developed according to those principles.
The "first release" of LessWrong is, well, this site. What's happening with LW 2.0 is actually called "introducing regressions", and I don't think the startup folks would endorse that. The combination of a full rewrite-from-scratch and a stringent deadline - the switchover was originally supposed to happen around this time, as far as I understand, albeit it has likely been postponed by now - is considered especially unwise.
Hopefully the LesserWrong folks can come up with something that's genuinely usable - there are quite a few things I do like about the new site. But the challenges are just as real.