Woud be more fun if settement attacks included Assaultrons, Sentry Bots and the other robots
Annihilator Sentrybot Mk II is clearly designed to handle multiple opponents and large area in mid-long range.
I would like to see it using its combat ability to full potential.. even if it is enemy.
Considering the Gunners use Assaultrons and Gutsy's at various locations, I would've expected them at least to use them in attacks.
edit: I did get multiple attacks at the castle on my first playthrough. Raiders and Gunners in all cases (Around three times)
Not sure.. But considering you can become hostile with the other faction that can assault the castle after the main questline is done, perhaps.
You can defend against the institue and the BoS both, yes. As well as random attacks, but since I put the castle defense over 100 I haven't seen those that I can recall.
Wait, if I choose a faction and see the ending...
The other factions start attacking the settlement?!