I think the dragon drone is better than people are making it out to be.
It basically seems to be a unit styled along the lines of the Contemporary Era artillery unit, which was useful because it could destroy assault tanks very effectively. The drone has low damage because it's not intended for 1 on 1 combat. It's meant for blasting a group of units simultaneously, and the bonuses against light/heavy ensure that they hit hard against both. Additionally, they have 30 movement and flying, which lets them hit rail guns on turn 2, which means you can deal massive damage to them before the rail guns get a chance to hit you (after shooting rogues).
I think it to, but not for the Rail guns. The rail guns has a high defense stats and this drone
doesn't has a bonus against it. also has this unit at the moment a low attack stats, so it deal
very low damage. The recon raider hit railgun afther 2 turns to, has a high attack stats and a
big bonus against it. So the recon raider is more effective against railgun.
If the stats been rise, especialy the attack stats, this unit will be a good wappon against
stealth units. Because the only way to attack stealth unit is to stand beside that unit, or
ignore stealth (powershot & blast). By dragon breath it doesn't mater that you has to stand
beside the target, it doesn't hit you anyway by revenge.