I've been going through all the races on skirmish mode in order to see how the various units work and how they interact with each other, and I have come to the conclusion that SOB Archangel needs to be nerfed really fucking hard. The other three angels are good relic units, but an archangel spawn is an automatic game over, even without upgrades.
First, the basic unit is about as strong as a reaver titan, which automatically makes it one of the best units in the game. Next, since it's a small melee titan with a jump-pack ability and no shields, it is immune to every counter that works against reavers-it's fast enough to minimize firepower against it, and it's impossible to form a defensive line against it since it will just jump right over, and you can't beat it in melee except with another melee relic unit. Because it moves like an infantry unit instead of a vehicle, you can't trap it with swarm tactics even if you manage to catch it while its jump is recharging-it's too manueverable.
Finally, if you manage to get even one upgrade on it, it becomes truly unstoppable. Even a full-upped manta can't kill it before it slaughters half or more of everything else, and it will wreck an Aeonic Orb in nothing flat.
I'm just going to quote some numbers from a full-upped archangel.
Health-114000
Damage-approx. 1500-2000
Specials-a few AoEs, plus a ressurection ability that brings it back to full health after it dies.
I've done both in-game and mathematical tests-on average, a 1-upgrade archangel will kill 2 reaver (or other ranged) titans, or 1-2 hierophant (or other melee titans) and still have enough health for more battle immediately after.
If it has two upgrades, approx. triple those numbers to 5-6 reavers or 3-4 hierophants, including ressurection.
I should point out that in a 4v4 game, it is currently impossible to spawn 6 reavers-you cannot produce enough relic points.
So please nerf Archangel.