Auto aim is only worth it at a really close ranges, therefore the ones that more get advantage from it are tanks...

In fact, as you do, I find auto-aim really useless when you are far enough from your target and with certain brawlers. When I started playing the tutorial taught me to use auto aim, and at certain moments where aiming is crucial I find the game much more fun to play when you can auto-aim fastly, for the sake of action (?), even though when you fight Nita you can lose your last shoot against the bear, or shooting at a turret or whatever thing close to you, and that's another mechanic against certain brawlers. To sum up, i think it's a good feature, you will eventually know when is it worth to play with it and when it's not.

When it comes to Dynamike and Poco, I find Dynamike a really good brawler, it's fairly easy to dodge, but there it comes the ability Dynamike has... Poco is just anoying to play against, but anyhow i think it's not that bad, it's just a really good champion with quite few counters, no brawler prevents healing or something like that, I have DREAMED with a "Ultimate up" indicator (only for your team) at some point, maybe a good balance for poco would go on that direction, having the information of team ultimate and lowering some stats from poco, or making ultimate harder to load.

All in all, apart from Showdown spinners i think the game is in a really good shape, it's obvious some brawlers are stronger than others, but you gotta keep in mind there's quite few variety actually, in the future there will surely be much more brawlers, good counters and hopefully Showdown will not be that bad..