This becomes significantly less impressive due to the show establishing that the Crystal Gems were never anything more than a pantomime that Pink Diamond put on to entertain herself - how actually competent they are as warriors is cast into doubt given that their leader was secretly controlling both sides of the conflict.
it's even foreshadowed in the Amethyst v. Jasper fight. Amethyst wasn't given proper training in how to fight*, which would mean that either Pearl and Garnet deliberately gave her a subpar education - or that the actual quality of their own training was lacking, due to the fact that "Rose Quartz" saw the Crystal Gems as more like pets than an actual army.
Combined with Blue seeming to be something of an armchair Diamond, that turns the fight into something a bit more like two kids fighting on the playground - neither of them really know what they're doing, so it becomes a matter of which one has more of an advantage in raw physicality. (Except, y'know, the 'kids' in this case are fighting to kill.)
+++
THAT ASIDE.
+++
As I said, Yellow Diamond is essentially a kaiju with combat training that also runs a military weapons program with a multiplanetary R&D budget. She'd be a Queen in her own right, even without the rest of the Diamond Authority - and arguably, she might well BE the Queen of that faction, mechanically, given that the other two contenders are Albino Mother Gothel and Mopey the Sad Targaryen.
* As we might have surmised from how her teachers didn't train her to make use of her primary edge over other Gems - the borderline Toon-tier shapeshifting she's capable of as an unintended consequence of being 'overcooked'.
Pretty much my take - although again, Yellow Diamond is head, shoulders, torso and waist above the other two - with the exception of how to estimate the effectiveness of Blue's despair aura. If he was already fired up, I'm optimistic that Father would either shrug it off, or actually become more powerful, because Father's reflexive coping mechanism in response to sadness, inner doubts, and other such emotions is "get angry and go hit something."