Well, the PPR works wonders on the GI. The Hurricane works in a similar fashion as the CSMG ("medium over time or back loaded damage") and it is widely considered the second best weapon for the GI (only behind the Talon).
The GI can do both Fire Explosions and Tech Bursts, priming with ammo and detonating with Proximity mines.
Forgot about mines on GI, but the combo isn't nearly as good as TC + front loaded damage weapon.
Don't get me wrong, PPR is amazing, but GI isn't really suited well it, and there are better kits for it. You cannot deny you'd do better with PPR on another kit, or another weapon on the GI.
Similar but not. Hurricane doesn't overheat and can be reload cancelled. Hurricane is front loaded, and doesn't require aiming (sure its extra damage, but not required), and best at short to medium distances. Whereas CSMG is best at medium to long and requires aiming.
Finally, GI is one of the most OP kits in the game. You can make the arguement sure with a kit this OP anything is great, but that's A) cherry picking results and
not true. Some weapons are just going to be OK, or work at base effectiveness (or barely over).
Don't try to tell me you'd use most sniper rifles with a vanguard for example. Its not going to end well.