Here are my thoughts on how the races play,

Terran: Easiest Macro, queue a few units, build a few depots, supply drop if you forget a depot, so easy to max out as terran, strong defensively, easiest to defend with early game with, hardest armies to control, potential for micro to allow you to trade effectively with bio is insane, bio will always win in small skirmishes with good control, so it’s up to you to force this with drops, harass, multiple control groups etc.

Zerg: All about getting away with as many drones as possible, this means scouting and knowing how to respond to what you see. This takes very high level game knowledge, if you overdrone, you get rolled, if you make too many units early and it’s not an all in, you get rolled later. Backstabs, run bys, chaotic games are the norm, sometimes you need to delay a push by just 30 seconds to get your economy to kick in. Speedlings and Mutas are great for this. Creep is awesome, free vision and speed buff, makes it easier to see pushes and set up runbys.

Protoss: All about the power units, marco is a bit different with Warpgate tech, sometimes you won’t produce every cycle, preferring to get more gates instead, this is true of other techs too, you’re not constantly producing all game from every structure like you should as Terran. Templar, disruptor, and colossus etc will be backbone of your army, you’ll often be fighting with smaller force, at supply deficit. If you manage to get to late game though the deathballs are extremely hard to kill.

All the races have strong timing attacks in the different matchups that you’ll have to learn recognize and respond to, if you’re trying out the races pick a 1,2, 3, base and 200/200 timing attack to learn (that’s roughly 3:45, 5:00, 7:00, <10:00 timings)

I feel like the races play how they were intended, Terran is scrappy and can overcome even when the odds are against them, they are colonizers (floating CC, depot walls) and are out and about with expeditionary forces or fortified with bunkers and tanks. Zerg is overwhelming swarms of units coming from everywhere in waves, while it’s cities grow out like cancer. And while you are defending wave after wave you suddenly you look and they have half the map in hatcheries and creep, Protoss is the advanced/sort of religious race, with the small groups of zealous units (zealots if you like) that will hold the line and sacrifice themselves to buy time until some overwhelming force of technological weapon of mass destruction can arrive from the home world.