Matchmaking Clarifications
Queue's seem to be grouped ~1 tier up and below besides the end tiers so:
Unranked: Unranked <-> Silver
Bronze: Unranked <-> Silver
Silver: Unranked <-> Gold
Gold: Bronze <-> Platinum (no more unranked teammates and so is often a huge shift in how games feel)
Plat: Gold <-> Diamond
Diamond: Plat <-> Crystal (another huge shift in how matches are played again)
Crystal: Plat <->Crystal
If someone is on a hard enough streak, it pushes them up a tier so you will occasionally see Plats against Crystal and Gold against Diamond etc.
In general, I'd say the following:
Unranked: No knowledge of the game mode as they're brand new.
Bronze: Haven't learned to focus targets, how to pick priorities, play the objective properly, or how to do damage properly.
Silver: Know how to focus a target and do damage, minimum understanding of the objective, still can't decide how to prioritize targets.
Gold: Decent understanding of the objective, still can't decide how to prioritize targets.
Platinum: Pieces start to come together, but people don't know how the strengths and weaknesses of multiple classes to know counters. Occasional targeting issue, but not as bad as lower elo where you'll find more people ignoring marked targets.
Diamond: People that have learned to be more consistent by avoiding deaths better than lower elo, they know how to burst and cc targets, good understanding of their main class, and know how to beat certain matchup's/comps. Shotcalling/target priority is significantly improved compared to Platinum and below, but still not perfect. Often are significantly more aggressive and play-making orientated compared to Crystal as that type of mentality is what gets you to Diamond in the first place.
Crystal: Best at macro'ing the game. Most likely to pull comebacks properly, most likely to be even k/da wise on a losing team, risk aversive, have near perfected the meta classes and know how to abuse them. However, since most Crystal only played meta to climb, they end up being Gold/Plat'ish as soon as they switch classes and get stomped out by Diamonds on their main class because they don't know the playstyle and their role in the team. A lot of times my best teammates are fellow Diamond players instead of Crystal just because most Crystal's don't seem to actually care about their performance anymore like that unless they're on the top 100. All of the best Crystal's on Aether I'd like to have on my team after over 200 games in Diamond/Crystal elo, are all on the leaderboard, most top 50, as Sage or Sam.
Personally, I'd change it to the following:
Unranked: Unranked <-> Bronze
Bronze: Unranked <-> Silver
Silver: Bronze <-> Gold (gets rid of the 2nd elo hell ppl describe)
Gold: Silver <-> Plat
Plat: Gold <->Diamond3-5
Diamond3-5: Plat<->Diamond 1
Diamond1&2: Diamond 2<->Crystal
Crystal: Diamond 2<-> Crystal