It's almost like players don't want to deviate from one "meta" build and build to accommodate the team they are fighting against, and they complain the system is broken when they don't build right.
No offense..... there are only 2 champs which imo outperform the right builds:
and 
Akali does so much damage that building tanky vs her really only means the difference between her killing you in 1 shot or in 2 chains. And she has 3.
Shaco atm can 2 shot any mage who has 280 Armor, simply by having
and
in his build without even having a
.
Twitch: build armor, back out of his attack range before he 5 stacks so that when he E's you don't take the huge hit.
Zoe: BUILD MAG RESIST (any at all severely nerfs her kit, and dodge her E. Her Q alone won't kill you)
Veigar: Banshee's Veil, Mercurial Treads/don't walk into the wall = gg Veigar. Only gets big if you let him.
Nidalee: Nidalee Q is still strong. In fact, the ONLY nerf it has had that has been sustained was on its max damage (among about 9 BUFFS) getting reduced from 450 to 390. The Min damage reduction was reversed and the AP scaling was reverted. Its projectile width was increased, mana cost reduced. Don't know where you get that it's weak.
Learn to build vs a team.