>You can go ANYWHERE
I'm serious, you can go wherever the fuck you want in the map, there's no arbitrary thing stopping you other than strong enemies.
>Huge vehicle system
Variety of cars, tanks including some special hidden ones
>Multiple party members you can swap out at anytime
They serve a similar function but have different skillsets, one of them is extremely unique cause she's a cyborg and cannot be revived via normal means, in fact if she dies in combat 3 times, she's dead for good, you can turn her into a chip to use on your weapons
>Can't rez like normal
There are I believe 2 revive items in the entire game, you can't die in combat otherwise you have to drag your friend's corpse to a mad scientist to get bring them back.
>4th party member is always a dog
A dog you can put a bazooka on.
>Multiple endings
There's tons of dialogue options that can lead you to an ending like an arranged marriage or joining a cult.
>Absurd amount of optional shit to do
From finding the super secret giga tank to doing all the bounties.
I found out much later that this is one bug game of a fairly popular series in Japan.
Its a great fucking RPG, highly recommend.
I'll only give one piece of advice.
When you do the final bounty and she says "Bring a vehicle if you want" listen to her. You will die otherwise.