My 2 cents is that he is right.
I leveled 4 accounts to gold and 1 from bronze. Silver 3 are full of people who think there good, but have no idea of how to play the game.
It takes me 10-15 extra games to get out of silver 3 instead of the usual 5-7 per tier..
The one major flaw in silver 3 i hate is all the tower diving for 1 person and end up giving triple kills.
Example 1: I would bully my lane opponent and he would have to back, Lucky for me he/she will lose out on 2-4 minion waves easily if he backs. Guess what.... Our jungler or Support would try and sneak from behind and just die. Which keeps him in game. I am a mid laner and this happens all the damn time.
Example 2: I would roam bot and got our self a kill, but my bot lane chase the second champion beyond tower to be surrounded and killed by the mid laner and/or jungler. This happens way to much in silver 3.
Just be happy with the little things, because it adds up.