I just had a game were my team (silver) could not defend base at all

Not only that, they couldn't ward, while enemies all warded deep jungle.

But the most of all what happened is uncanny on the defensive side:

So they were pushign 4 mid.

Garen Tp bot with wave and destroys turret+inhib, mid tower had low hp so since Garen is rito's overpowered joke, but moving on he manages to destroy it and all the inhibs. Meanwhile, my team is mid sieging enemy's mid tower. Nobody came to def while garen systematically destroyed 3 inhibs and 2 towers. NOBODY CAME despite heavy pings

HOW IS THE FUCK IS THIS BALANCED MATCHMAKING?

HOW? A TEAM THAT HAS 0 KNOWLEDGE ON OBJECTIVES VS A DECENT OBJECTIVE TEAM.

SICK JOKE RIOT IS PULLING WITH THIS SHIT MATCHMAKING