You do get an ally at the beginning, but he dies after about the first 5 seconds. As for stocking up on huge weapons and crap, they changed alot of the weapons, and made the nexts abit harder. the sniper rifels have about 16 shots, shoot slow as crap, but can do over 10000 dmg if two of the stronger ones hit at once. The granade launchers dont hit, at all, theres no chance, give up on them, there usless. as for cannons and crap like that, not enough ammo to kill 4 nexts, maby one, but not 4.
main reason granade launchers are usless in this game tho is that they sped up alot of crap, and im pretty sure the enemy nexts have infinite energy