That's because the average "Nerf this!" Post goes like this:

"It killed me! Nerf it!"
Or
"I can't kill it! Nerf it!"

And people who think they are great players assume that everyone else suffers the same problem and aren't willing to learn or change their build to adjust to the situation.

The majority of "Nerf this!" Threads are just rants and not particularly well though out at that.

I vote they should Increase Ult costs

Majority of Ults have become a standard part of Rotations and no longer feel...Special

Increase cost and people/zergs will use them more sparingly...

(Heh just made a PVP screw’n over PVE suggestion...that PVP’rs are going to hate... I’m going to get roasted like a marshmallow that fell into the campfire...)

I think we're currently living in the age of entitlement.

It's a numbers game. There's always going to be tiered skill levels and the higher tiers will always be outnumbered by the lower tiers so if they get together and come whine on the forum about anything, they're going to win. The top 10% who put in the time, effort, practice on rotations, tweaking, etc. will be overruled by the 90% who don't and merely just complain on a forum thread and the inevitable nerf wrecking ball will swing.

That's why I like chess. You can play those in your tier of skill, the game will not change or be nerfed, and you always swap sides so it's an even game. If you lose, you only have yourself to blame. If you want to play with higher skill levels, you practice and work your way up.