OK, sometimes the boards DOES exaggerate...
Just look!
We thought the Rengar revert was OP, we were WRONG. It takes more to kill someone with Rengar now.
We thought the baron buffs would be too much, but look, after they have been released, its not that bad is it? We were WRONG again.
People were complaining about the mage changes, they thought it was bad. They were WRONG.
When people were complaining about Nasus, they didnt think of how easily he can be countered and killed, just an ignite and 2v1. EXACTLY LIKE DARIUS AND EVERY OTHER JUGGERNAUT BTW. People just complained because he stuck out as "infinitly scaling" until you actually take a look at Garen and Darius and wonder why they always need to be 2v1-ed late game in order for them to actually die. Now Nasus is somewhat back to normal. WE WERE WRONG AGAIN.
(there is currently a WW argument, but people dont know how to play against him well, so im not gonna jump onto that argument)
Just because we are the boards and may agree on things, that doesnt mean that we are definetly right no matter what.
Sure, sometimes we can be right. For example Zoe was extremely busted and could one shot with one Q (the only champ in the game that can do that btw) so they nerfed her.
Their was also a few more, but I dont need to go over them.
TL;DR
Keep an open mind and try to see why your thinking may be wrong sometimes and try to explain it in detail on the board instead of just writing what the champ did, or what happened.