Why would a developer want to get into the Japanese market? Simple really. Cold hard cash. It's why we have anything really. Including games.
I don't know what planet you're pretending to live on but here on earth there's a pretty simple rule to understand about news. It's that no news is good news, and bad news is news. Seriously. Open up any news source. Unless something is fucking stellar it won't be reported on. Why anyone needs flowery words to do their job to earn money sounds silly to me.
If you read the article above it goes on to say that most of the bad reviews were justified in their criticisms.
But I'll offer a suggestion to fix the problem of these butthurt developers. Petition Steam, or other review sites, to change the way scores are done. Change them to a percentage of players who played who gave poor reviews, instead of a percentage of the reviews. Boom, problem solved. Now instead of 20% of the reviews being bad, it's 2% of the players. 98% don't think it sucked, so it must be good.