Herm? Angels having the disadvantage? Let's see.....

Well, Gwynn basically flew from the outside of the ship to the cargo hold without hitting any significant resistance along the way, in spite of only having a general location for Diana and not knowing the layout of the ship....

Azazeal pretty effortlessly ruined the whole acid rose trap Victiore had going on, without any serious loss to the angelic forces....

Raziel basically used magic lightning EMPs to wipe out the Machina on deck besides Grafdakka, though he does have an excuse as a special unit.....

Generally near totally unaffected by any automated or stationary defenses that might be present in the giant fortress, including anti-air fire, turrets, etc. I've been told that this is my fault for not being specific, but the point still stands when the non-PC Machina barely even pose a noteworthy challenge....

Basically, from where I'm sitting it's hardly like things have been unfair to the Angels. If anything they've been unfair to the Machina, since any natural advantage they might have in controlling the giant walking fortress of doom has been basically negated within a couple sentences besides the trump card.