Subreddits are generally cesspools, especially games like these.

Like you said, when people have literally thousands of hours spent on something, they can get passionate about it to a bit of an unhealthy degree.

I just bought WH3 the other day, and at least as a fresh player it's a crazy good game. I'm sure there's lots to be desired in terms of balance and all that, but that's the kind of thing you start worrying once you're 1000 hours into the game. For now my sole focus is "Holy shit a giant boat skeleton colossus that shoots a giant cannonball?!", repeated for every single new enemy type I see.

The game has so much content it's almost overwhelming, to be honest, so I can see myself spending the next 800 hours being amazed by everything until I start seeing cracks.