I personally find Steve Blank has some interesting things to say and Eric Ries not so much, comparitively. The latter seems to be trying to turn a simple idea (combine agile engineering practices with Steve Blank's "customer discovery/validation" idea") into a consultingware "movement" with kool-aid conferences and such, just as with all business fads. The jury is still out on the eventual success of such efforts.

The nearest analogy is the whole "Agile" movement. There was a useful/interesting kernel of ideas but it was soon overrun by scammy consultants (e.g the hwle "Scrum Master" certification scam). I suspect "Lean Startups" are on the same path.

I do think Mr.Ries has some (mildly) interesting things to say, but (and this is probably blasphemy for at least a subset of HN readers) my "marketing bullshit" filter is on at high when I read or listen to him these days. I believe that the whole "lean startup" movement is in its early stages of being overrrun by scamsters so there are still interesting ideas there.

So yes, (imo) at least some part of the "Lean Startup" (the phrase is copyrighted by Mr Ries btw!) stuff is marketing BS. As always you as the consumer of such fads have to use your intelligence to discard the marketing fluff and find the useful core. And every fad generally has a (sometimes tiny) useful core.

Caveat Emptor. Useful idea, especially as it applies to methodology salesmen, irrespective of whether said methodology applies to sw dev (agile) or building/running a business ("lean startup").