Had an engagement with 4 deathclaws, 1 Alpha, and a Behemoth just outside, and in the woods, west of Natick. It was...interesting. Mines and Missile Launchers really are your friends. If you want at least one longer, drawn out engagement, Gunner's Plaza offers a few goofs.
As for me, I actually like the balance of the engagements. However, I'm not one to turn down more combat, even the mindless sort...it is after all fun, amiright? And nothing quite as engaging and fun as fighting for your life, not really knowing when your enemy is going to run out of gas.
But I wouldn't mind seeing other options to avoid combat, and have more adversaries with an underlying "willing to listen to reason, or barter a truce" mechanic, based on your Charisma, Speech, Strength score, the weapon you're holding in your hand, or even small group of adversaries armed with pipe weapons who see two power armor-clad, heavy-weapon wielding bad asses with vertibirds hovering over them, and them being smart enough to raise their hands.