When I first saw an episode or two of Full Metal Panic (and browsed the manga) it seemed to be a high-school drama anime with a little mecha mixed in here and there. I was repulsed by it because I hate to see anime where the humor is a female beating up a nerdy male.
In fact, why the hell are there so many anime where some overly agressive females that act like they're hyped up on testosterone beat up on a weak male? What, are all Japanese males submissive sadomasochists? That's why I stopped watching Love Hina, it got boring with all the shit.
However, I have to say that The Second Raid is mostly free of that BDSM shit, and full of bloodshed and giant robots. It is made of win and God.