In the last few days, I've been matched with Bronze and Diamond players

Why have a matchmaking system at all then?

The whole point of having one is to trade fast queues for balanced matches.

But if you're going to widen the accepted range THAT much, just remove the filter altogether and match us with whoever is available!

This halfway point we have now instead is the worst of both worlds: you get to wait in queue for a minute, and then enter in a match so random that it could have been made in seconds, by simply collecting whoever was online at the moment regardless of skill level.