PistolThe Caldari literally took years to develop theirs, the Amarr took years to keep theirs from exploding and the Gallente one over heats so it leaves you vulnerable when you most need it.
The Minmatar just got a water gun, cut the barrel off and put illegal bottle rockets in it.
CommandoThe Amarr took off armor and shields to route extra energy to their laser weapons. And the Gallente and Caldari both gutted the suits to use extra processing to make more efficient use of their weapons.
The Minmatar just cut some armor to make it lighter and duct taped regular damage mods to the outside. That's it.
Target AcquisitionThe Amarr spent a ton on visual systems to help users detect fast movements, the Gallente made use of as many visual inputs as possible to find targets in even the foggiest of conditions. The Caldari helped simplify their visual system by relying on only one visual input to make their system robust and be user friendly.
The Minmatar just colored one of their eyes black and poked a hole through it so it would act like an
aperture sight. So yeah, literally a tiny hole.
SpeedThe Gallente and Amarr spent a fortune developing biotics to improve their speed, endurance and overall movement.
The Minmatar just did exercise and made their suits mostly out of scotch tape, using duct tape in only the most vulnerable of areas.
AccuracyThe three other empires took years of R&D to make their rifles as accurate as possible with the Gallente even having protocols built into their Assault suits to improve the Accuracy of their Assault Rifle.
The Minmatar just made it a burst weapon so that recoil was irrelevant.
TankThe Gallente decided to just use as much Armor as possible as well as reppers. The Caldari decided to use as much shields as possible and use rechargers and regulators to keep them in fighting order. The Amarr saw the weakness in both these systems so they decided to just use as much Armor and Shields as possible.
The Minmatar thought it was better to not get hit in the first place so they made a health balanced suit that was fast.
The Minmatar are the most intelligent of all the people because they find easy solutions instead of relying on superfluous technology that will just give them more trouble down the line.