Question, do my Servants stats, even if they're significantly nerfed?(As an example, C being normal, B is +1, and A is +2, with below C being negatives)
Similarly, do the Skills apply(Except, y'know, nerfed differently, because it doesn't make sense that having a skill but not being that good at it would be able to make you worse at doing it then someone who doesn't have the skill)
... basically, I'm asking if the Servant descriptions are pretty much accurate to how they will work in this game, or more like summaries, like how I'd assume the Command Seals are only to force obedience rather than to command them at all.
Also, would it be accurate to assume the enemy cruiser is currently on the ground?
They are game/anime accurate, yes. So, for example, a Rider-class Servant with an A in Riding would have +2 to boarding and piloting whatever the hell they've got. They're balanced by, unlike in Fate, being able to be hurt by normal, non-magic humans as well as their bonuses being a set +1/+2/+3 etc buff.
Skills also apply. They are part of a Heroic Spirit.
What you just described for the Command Seals is how they already work, though. The Servant has sentience, but are still obligated to serve you. But they can serve you without the Command Seals. Masters get three Command Spells to force obedience, even in official works like Fate/Zero.
And yes, that big bitch is on the ground and not in space.