Orcs are nasty buggers, no doubt about it. Beatable, sure, but the only thing that scarier than an orc siege in the first summer is a visit from some of the captain's megabeasts from LL (and even then Dig Deeper has nasty megas of it's own *GCSQ shudder*).
I have this sudden urge to rig a fight between a GCSQ and a Bane Dragon, just to see who wins. My money is on the Bane Dragon, but only because I think they have [NOSTUN] making the GCSQ's webs useless while the GCSQ is still vulnerable to fire. But you never know, I've seen the GCSQ disembowel a dwarf is mid quality steel armor inside of five rounds and 11 expert to legendary marksdwarves completely failed to even scratch the damn thing.