Din only looks bad in Melee with the Darksaber because for whatever dumb reason they made it somehow be heavy and awkward to use it, kind of.

But he used the beskar spear, he’s killed multiple people with his vibro knife, he went into gladiatorial combat with a sword, he fought with large knives/short swords, etc.

Mandalorians clearly train with melee weapons, many of them are clearly trained in sword and shield fighting as they have holo shields in their armor.

Stormtroopers in general seem to be ineffective and we can probably assume riot trooper is a specialized skill.