Since it seems nobody has answered you yet, I "like" Pachter because he is one of the few people out there admitting that Nintendo needs to do something because the Wii U is not working and the 3DS isn't attracting like their previous handhelds have. Most people have a "it'll be fine, it's Nintendo" attitude. Believe me, I have as much E3 hype for Nintendo as the most hyped hype-ee on the hype train, but things are not fine with Nintendo. They need to stop being stubborn and do something.
What I don't like about him are videos like this. His comments about parties are completely unnecessary in this situation. Want to make a video about memories of E3 parties? Cool, do that. But using the fact that there is no actual press conference this year to emphasize that Nintendo has had to cut back (which is just an assumption on my part since he did not make that clear at all) isn't getting your point across. Pachter needs to stop talking about himself in these videos. Yes, you need to make it entertaining, but you can make facts entertaining. We're not a dumb audience.
Another thing I'm not a fan of is anytime he mentions how he believes Nintendo should go third party, he almost always brings up something like putting Mario on an iPhone, and then people latch to it and won't let go. The discussion over Nintendo giving up hardware completely revolves around the idea of Nintendo on mobile, rather than Nintendo as a third party in general. I'm a huge Nintendo fan, and have grown up right along with them, owning every console they've put out from the NES to the Wii U. I'm also a huge supporter of Nintendo ceasing all hardware manufacturing and becoming a pure games studio and publisher and going third party. I do not get what is wrong with this. I think that is a topic worth discussing, but one of the few guys who actually brings that topic up always blows it by talking about Nintendo on mobile and not the bigger picture.
So I guess it boils down to me thinking Pachter is a dude who has some good thoughts, but doesn't know how to express them properly without pissing people off. I'm cool if people don't like Pachter, what I'm not cool with is people who pretend like everything is fine with Nintendo and this will all blow over.