Brutas: By far the best choice and most versatile one. Provides the best bang for the buck i find my opponents were the most intimidated by. The fact that they're slow and tanky makes it the ideal choice to combine them with other elites. I would say they're a game breaker and way way too OP.

Cracks: Still an excellent choice for sneak attacks but as soon as the ennemy uses anti-unit towers, tassadar or sentries its GG for them. Therefore i feel something needs to be done, like the cost of entry. Maybe instead of costing 650$ to up them, make it 150$ and their upgrades make them cheaper too. After all their main advantage is speed. They're easely hard countered.

Tanklings: Either need a bit more Dmg, armor or HP.

Firebats: Too strong vs Goliaths i find.

Zealtos: Way too weak, spawning is way too slow. Something needs to give on these guys

Savior: Disable saves for the first 10 mins. There's too many options in the game that dont require the saves.
Make them walk faster so they can cover a wider range. I find it its unfair for the ennemy to be able to sit in a concave position and camp there. Saves should reach as much as much as the tower can detect.

Medivac: They already provide heal.. the extra armor is unecessary

Banshee: Remove Stealth, they're already on the air and do some serious dmg.

Vikings: I feel they need to deal a bit more dmg, they need to be a hard counter to air elites.

Reavers: HP scaling... way too low.

Odin: AA needs to be a bit quicker and deal more dmg to elites.

Sentries: Energy for 2 max, 1 sentry and slower energy regen



Just my thoughts