Because you're just regurgitating what you read on forums and acting like a smug know it all. Forums are ALWAYS full of whiners. Game is completely doable on inferno, and while SOME champ packs are absurd, probably 75% or more are absolutely killable without cheese.
You don't even need great gear, just highly defensive builds all around works fine, you don't need absurd dps to do it before berserks (though sometimes a pack may go berserk, if you've thinned it out that's fine just let it reset).