That is a steaming pile of horse manure.
To begin with the Gladius was a point heavy weapon which was known for being a brutal cutting blade. The Greeks were so horrified by it they demanded it be banned. The Roman response was, "Well you would say that, you lost." The Gladius is a cut-and-thrust weapon, not a pure stabbing blade, if it were it would taper to a point, rather than having a broad blade.
As far as the Gladius being, "basically superior to any other sword in the world", lets have some fact's about the basic infantryman's weapon.
1. Point heavy to the extent that effort is required to prevent the point of the blade dipping.
2. Heavy, on the bad side of 1KG, often closer to 1.5 and only the narrower Pompeii pattern regularly drops below that weight.
3. Low quality, particually from the late Republic onwards, one sword examined showed base incompetance in the forging which resulted in the sword edge being ground to the point that the outer layer of low-carbon steel was removed and the edge formed of uncarbonised iron.
4. Generally speaking the pattern of later Gladii is inferior, the swords become broader towards the point, have a broader point and lose their leaf shape. Personally I would say that this simpler design was a result of mass production and poor materials as an attempt to reduce breakage/maintain an edge on bad steel.
As an armour piecing weapon the Gladius is underwhelming, though its stout, broad point do give you some hope of forcing mail links without damaging the weapon a narrower point would do a better job.
The Gladius is a brutally simple weapon and relatively easy to use because it is a short sword, but the advantage the Romans had was in their drilling and the uniformity of their gear. They excelled at being uniformly average, which is a wonderful thing in an army, it means you have no very weak points.
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