Marksmen in Every Game
I'm around 1100 MMR, and every single game I play I see a line of marksmen in the backline. I consider this the laziest strategy because it's good single target damage, and works in every comp due to the ridiculous range it gets. It also scales well where others do not, like a rival starting unit in the saber.
You can go to air with something likes wasps and rays make things difficult for these units, but wasps and rays are pretty vulnerable units. The strategies around them require a lot more planning and techs than the braindead line of marksmen.
I don't see the upside to this unit's design. I wish it wouldn't have a large presence in every one of my games.