It's a big release from a big creator - it's going to get the typical shitty gamer treatment. I just think Kojima needs to be aware that he made a game that not everyone was a fan of. It's a unique and gorgeous game with a good vision - but it's not like it got some bad reviews because it "doesn't have enough shootuns". A little humility does good in this industry.
This is not the only time the hate has come out though, it's been constant and it'll probably remain that way right up until his next release.
Not everything Kojima touches is gold though. Peace Walker had godawful gameplay mechanics.
I thought it was one of the best PSP games made better when it got HD treatment.
You can have your own opinion about the story but I thought it was a huge improvement over Portable Ops and streamlined a lot of what made that game decent.