Anyone else think Diamond is the worst tier?

Master & better, everyone plays to win. Below Diamond, most players at least try. At Diamond you get the boosted (or seems like it) players, the talented throwers that afk if one bad thing happens, etc.

Anyone else feel me on this?

I think this is true, mostly because diamond is the best place for high level friends to meet up with their lower tier friends and group together.

I haven't made it to Masters (yet) but I have a Diamond account on which I play Sombra, Zen, Moira (in that order) and a low-Platinum/high-Gold account I use to play with some Silver-ranked friends. I regularly hop back and forth between the accounts.

I find that players in my Diamond games (~3150 SR) are much more focused on positioning and communication, are less-easily tilted, and are even more open to uncommon hero selections.

My games in high-Gold to low-Plat are rife with "_____ SWITCH!", throwers, trolls, poor teamwork and communication, poor hero selection, and generally poor PMA.

Maybe Masters is even better than Diamond, but in my experience I'd take Diamond over Plat or Gold any day.

I'm sure bronze is worse

I've only ever been in plat and diamond though and diamond is better

3750 - 4000 is the biggest cancer. Lots of DPS mains with a lot of ego that think they belong to the top500 tier.