Bitcoin's elegance, distributed nature and the math behind it are powerful forces he doesn't begin to grasp, which is evident when he equates it with Digicash and Beenz. I have my own doubt and misgivings about Bitcoin, but an attitude of epistemic humility is much more fitting.
As for the allegation of the exchanges (repleat with scare quotes) being flaky: partially true, when the standard of comparison is institutions that have been in existance for decades in a gigantic multi-trillion-dollar financial system. But when you consider that until two months ago, the total value of all bitcoins in existence didn't exceed the market cap of even a single publicly traded micro-cap stock, only modest operations could have possibly existed, and they are necessarily very new. As Bitcoin matures and grows, the system around it will mature and grow. Witness Camp BX as a promising development in this regard. And MtGox may have learned some lessons, and their recent revenue growth will likely fund commensurate improvement in their own service.
The recent publicity brought what surely was a speculative blow off. There's a world of difference between speculative excess in valuation (which happens to many perfectly-valid asset classes), and collapse of the tulip bubble or a ponzi scheme.
His inept, mostly stale website is testament enough. But consider what he asserts.