Everyone should consider him a joke. In 2009, he predicted the Wii, PS3, and Xbox 360 (7th Gen) would be the "last" console generation. A prediction that he then carried over in 2013, saying the 8th Gen would be the last console generation and that consoles will no longer be relevant in 10 years. In 2011, he cost his investors opportunity at a 2,000+% return by advising them to sell their stocks in Netflix, calling the company "broken" and not worth more than "$6 a share". Netflix is currently worth $646/share.
But, the reason that Nintendo fans get more riled up by his predictions are because he tends to dunk on Nintendo a bit more, like these gems:
A Visionary? History of Michael Pachter’s Bold Predictions (sorry, I couldn't find a link to the actual prediction, but here is a recap of it)
"Back in 2006, Mr. Pachter predicted that Nintendo will soon pull-out of the console business. He also claimed that Wii motion controls won’t be accepted by the community."
Motion Controls were so accepted that mid-gen, both Microsoft and Sony were forced to attempt to capitalize by releasing the Kinect and PlayStation Move to reinvigorate the sales of the Xbox 360 and PS3 which were lagging well behind the Wii.
The Nintendo Switch will not be as successful as the Wii according to analyst
In his recent statement, Pachter said: - "Over time Switch will be fine it will do 50 million if the price comes down the curb. The question though is will it do a hundred? I don’t think so that’s 20 million a year. 10 Million a year for 5 years for sure, 20 Million a year ever probably not."
By the end of 2021, the Switch will have back to back years of selling over 20 million per year.
Nintendo Should “Get Rid of the Switch Console and Only Have the Switch Lite” – Michael Pachter
“I don’t really understand the whole hybrid concept,” Pachter told GamingBolt. “I think that was something Iwata did to differentiate the Switch, and he wanted to have a console that could go back and forth from console to portable. But I don’t think most people play it in both modes, I would say that maybe 20% of Switch owners play both modes; and I think most Switch owners play it handheld only. So I honestly don’t understand the whole point of the hybrid. Who cares? Play it as a handheld.” “And Nintendo isn’t that smart,” he continued
Nevermind that the Hybrid model has consistently outsold the Lite, and that Nintendo's own data shows the hybrid was being used more in both modes than it was as a pure handheld.