It's what we do. Just everyone has the internet now, so everyone can voice their opinion. Go look at how DnD was reacted to back in the day. Every new rule set, complaints. Yet people still play it.
On one hand, people complain in hopes of getting the devs to improve the game. Others complain because of ridiculous entitlement from being a fan so long. Then the trolls come in and complain to get a rise out of people.
If you think this is a new thing, you probably don't know other gamers. If you're that annoyed by it, you probably shouldn't speak to people.