G3 pros:
>good aluminum mags
>pretty good sights
>decent accuracy potential
>flat trajectory and good barrier penetration (real missed opportunity nobody ever made a GPMG in that there 7.62mm NATO cartridge)
>looks sick as fuck
G3 cons:
>+9lbs, just about 10lbs loaded if it's the G3A4 model with the sliding stock
>7.62mm NATO recoil in a 9lbs select-fire rifle is still kind of awful
>made a bit worse by the violent delayed action
>farts carbon all over the inside of the gun with every single shot
>worst controls ever, like reloading a Mauser rifle while holding it from the muzzle end, awkward mag release, no LRBHO
>big slot on cocking tube invites dirt, even the slightest bit of sand getting in there means the rifle is gonna seize up hopelessly
>only way to mount optic back in the day is a bulky claw mount
>milspec German triggers are completely atrocious because "muh dropsafety" autism
>bad triggers, military ball, and G3s not actually being built to PSG-1 standards means accuracy really isn't anything special
>launches brass into the stratosphere, mind your squadmates