If there is an army that shouts MSU at you, it is the Drukhari when they are using many units in Venoms and/or Raiders. Each small transport comes with a squad of five little dudes inside that are equipped with a blaster or shredder. And then they can be copy-pasted until you run out of points. Other Dark Eldar armies can follow the same formula with small units of Mandrakes, Scourge, or even Wyches.

Part 2 – The Good, The Bad, The They are Everywhere!

In ITC Champions Missions, you score points every turn for killing an enemy unit and for holding an objective. And every battle round the person who holds more objectives gets an additional point, and the person who kills more gets an additional point. There is also a bonus point up for grabs (usually this bonus is based on holding objectives or being close to them), and lastly, each player picks three different secondary objectives (each worth 4 points). Some are about killing things, and some are about holding things. SO... how does this interact with an MSU army?

Pros

MSU armies have an easier time taking objectives and controlling the tablespace. Usually, this is done by sacrifice; take your smaller units and send them to capture an objective, or deny the opponent an objective. You can send them to a table quarter or into the middle of the table for King of the Hill, for example. You can use them to move block enemy units and screen out against deep strikers. The key here is that EVERY unit in an MSU army is designed to be expendable. Once you commit the small unit to do their one job, you can sit back and watch them die the next turn, and then you have another unit in your army that can step up and do the same thing again! This means that losing a small unit (like a Kabalite squad worth 30 points) can be done many times in a game, and it does not take any of the capability away from your army strategy in general.

These armies typically have excellent built-in mobility (like Impulsor spam, or deep strike Scions, or Venoms, for example). In ITC, an MSU army does very well with the holding ground and taking objectives secondaries. They will usually be well-suited to taking the bonus point multiple times during the game as you can send these small units to their deaths simply to get points. This also means that the army is usually comfortable going first or second, as taking casualties is part of how the army functions, and losing some of these units at the start of the game does not normally cripple those functions. So if you want to play an MSU army, play to its strengths and focus on those positional objectives and bonuses.