If an experienced Bitcoiner looks at all the things this Mike Hearn dude has said, then the only proper reaction would be to laugh very hard. Like seriously, I still don't understand why the market reacted like it did back then. Whales are whale for a reason, they know exactly how to make money. But are they that easy to influence to make them start dumping like there is no tomorrow? Very weird.
My understanding is that Hearn is technically knowledgable, but he demonstrated questionable ethics during his time as a bitcoin dev. He pushed hard for identity verification in the client, and was involved in the implementation of blacklisting in XT.
Nonetheless, some of his technical gripes do have merit. Nothing that can't be solved calmly and patiently.