Power Pod: Fragile but easy to place with transport, power pod can both secure and buildings and offer amplify, and refuel can help get key slow-moving units into position.
Saucer: Fragile but necessary; there’s no other unit that can transport the power pod or the nullifier pod.
Vanguard: Fragile (do I detect a theme, Martians?) but they throw good amounts of boost die and have a useful trigger; these are the workhorses of my force.
Hunter: Nope. A sniper unit without native boost dice? Doesn’t work for me, despite the long range.
Marauder: Great for the explosion trigger and indirect fire.
Reaper: In a blast-oriented list like mine, the Reaper doesn’t make the cut.
Despoiler: I’ve been on the receiving end of Red Sniper, and I know how damn good it can be. Long range doesn’t hurt, either.
Nullifier Pod: Weaken is key for delivering damage to monsters on unit turns, and can help a pack of Vanguards each sniper a unit, for a massive power die upsurge.
Summary: Martian units are fragile, so they won’t stick around for long, but they hit hard, reap power dice, and can either control crowds or blast monsters.