Here are some excerpts from the novel featuring Plagueis's combat prowess for your erudition:
The Woebegone had just reverted to realspace when 11-4D’s audio sensors registered unusual sounds from aft: an activation click, a prolonged hiss of energy, a dopplering slash, a stuttering exhalation of breath. The sounds were followed by a sudden outpouring of heat from the corridor that accessed the cargo bays and what might have been interpreted as a gust of wind. Only by adjusting the input rate of its photoreceptors was the droid able to identify the blur that raced into the cabin space as a male Muun dressed in a hooded robe, trousers, and softboots that reached his shins.
The face-off tableau in the cabinspace had endured for only a moment when Wandau, who had served as a bodyguard for a celebrated Hutt, leapt into action, drawing and firing his blaster even as he raced for cover behind one of the bulkheads. A split second behind, Maa Kaap raised his weapon and fired a continuous hail of blaster bolts at the Muun. In the same instant Zuto and PePe, crouched low to the deck, sprang forward in an attempt to outflank their opponent and place him at the center of a deadly crossfire.
[...]
The Muun’s reaction to the barrage of bolts that converged on him required almost more processing power than the droid had at its disposal. By employing a combination of body movements, lightsaber, and naked right hand, the agile sentient evaded, deflected, or returned every shot that targeted him.
The Muun caught the lightsaber, but instead of bringing it to bear against Maa Kaap, he danced and twirled out of reach of the vibroblade and commenced parrying the Zabrak’s martial kicks and punches, until a side-kick to the thorax drove Maa Kaap clear across the cabin and slamming into the bulkhead. OneOne-FourDee’s audio pickups registered the snap of the Zabrak’s spine and the bursting of pulmonary arteries.
Having run himself through a similar test, Plagueis knew that he had lost a great deal of blood, and that one of his subsidiary hearts was in fibrillation. Sith techniques had helped him perform chemical cardioversions on his other two hearts, but one of them was working so hard to compensate that it, too, was in danger of becoming arrhythmic. Plagueis moved his eyes just enough to fix the locations of some of the two dozen assassins that had survived the Sun Guards’ counterattack; then he dug deep into the Force and catapulted himself to his feet.The closest of the assassins swung to him with raised vibroblades and rushed forward, only to be flung backward off the canted stage and against the room’s curved walls. Others Plagueis felled with his hands by snapping necks and putting his fists through armored torsos. Spreading his arms wide, he clapped his hands together, turning every loose object in the vicinity into a deadly projectile. But the Maladians were far from run-of-the-mill murderers. Members of the cult had killed and wounded Jedi, and in response to confronting Force powers, they didn’t shrink or flee but simply changed tactics, moving with astounding agility to surround Plagueis and wait for openings.
The wait lasted only until Plagueis attempted to unleash lightning. His second subsidiary heart failed, paralyzing him with pain and nearly plunging him into unconsciousness. The assassins wasted not a moment, throwing themselves at him in groups, though in a vain attempt to penetrate the Force shield he raised. Again he rallied, this time with a ragged sound dredged from deep inside that erupted from him like a sonic weapon, shattering the eardrums of those within ten meters and compelling the rest to bring their hands to their ears.
In blinding motion his hands and feet smashed skulls and windpipes. He stopped once to conjure a Force wave that all but atomized the bodies of six Maladians. He spun through a turn, dragging the wave halfway around the room to kill half a dozen more. But even that wasn’t enough to deter his assailants. They flew against him again, making the most of his momentary weakness to open gashes on his arms and shoulders. Down on one knee, he levitated a Sun Guard blaster from the floor and called it toward him; but one of the assassins succeeded in altering its trajectory by hurling himself into the path of the airborne weapon.
With nothing more than the Force of his mind, Plagueis rattled the floor, knocking some of the assassins off their feet, but others rushed in to take their places, slashing at him with their vibroblades from every angle. He knew that he had life enough to conjure one final counteroffensive. He was a moment from loosing hell on the Maladians when he sensed Sidious enter the room.