Honestly, I approached Bookchin with an open mind, assuming that there must be some kernel of correctness to his work to inspire such dedicated shilling.
He certainly starts off strong, he probes at a lot of the blind spots in Marxist/anarchist thought quite incisively.
The problem (similar to the leftcoms) comes when its time to put away the criticism and make your own position clear. It's at that point that the full stupidity of Bookchin-thought flourishes.
As soon as it comes time to talk about his own proposals, he immediately and violently throws materialism under the bus. From this fundamental mistake, all of his subsequent prescriptions amount to a declaration that 'stuff would be great if everyone just decided to change their minds tomorrow and run the world perfectly, instead of shittily, like they do now' - in other words, pure utopianism.
Now, I am someone who thinks that charges of utopianism are thrown around too easily on the left, especially by leftcoms. I think there's a difference between utopianism and a practical prefigurative political program. As an aside, I happen to think that nobody on the left has bothered to come up with such a program in the entire history of our movement, and that the failure to do so is one of the key causes of our repeated failures through history. Nonetheless, I do not discount the possibility of such a program's development.
Having said all of that, I find that Bookchin makes a point of falling on the wrong side of that divide. His prescriptions are utopianism of the worst, most useless kind. He goes to great lengths to describe what his ideal society would look like, but provides no clear practical reason why humanity would uproot the entire existing system of social organisation to build it. The three reasons does provide are one of a) useless moralism like 'it would overcome hierarchy' [poorly defined of course, and his system doesn't necessarily do so in any case], b) potential aversion of future disaster [has never motivated change in the past, why do we expect it to do so in future?], or c) an assertion that his system is 'better' [by any number of metrics, none of which provide enough incentive to totally upend society as it is currently configured].
Worst of all, key parts of his system remain unspecified. How should large-scale production be co-ordinated between communes? Do we jettison all concept of society-wide improvements in resource efficiency in order to pursue our fetishised localism? What prevents competition or economic domination of locally resource-poor communities by resource-rich ones? How is military defense to be co-ordinated, considering that many semi-self-sufficient, dispersed communities would be a perfect target for conquest by a centralised aggressor state? Who builds the fucking roads? That's just the beginning. You could fill a book with basic, practical questions like this.
If you're going to blueprint the future society, you best come correct.
In conclusion I will simply say that the 'google Bookchin' meme, while successful at raising awareness, suffers from the same problem as its immediate ancestor, the 'google Ron Paul' meme: The person you want us to look up has terrible fucking ideas.