Bottom post of the previous page:
Their use of DLC is also interesting as it is very ala-carte. You don't need any of it and you can have a top tier loadout without it. You also can go to all the missions and even join them without owning the DLC or knowing a friend with it. Some DLC has more of an effect on the game than others. The Shotgun DLC adds special ammo for the shotguns that can dramatically change playstyle, and while default ammo still has some use 00 ammo is for many builds extremely strong. Likewise the weapon pack that adds grenades in helps you out way more than you would think, to the point I am kind of miffed because its the only DLC that flat out adds power directly to your character.The best DLC to get however if you get any, after getting grenades, is grabbing the courier pack. Those guns you can get are neat, but if you are not using that gun you are not getting value from the DLC. But those courier mods can be used on anything and are often a great way to specialize your gun further.
Meanwhile the assault and sniper DLC isn't at all mandatory and you can just skip them if you don't want to drop the cash. They have good weapons in them that are top tier but they don't invalidate anything else in core. DLCs also tend to, but don't always, have things for DLC owners to grant to their buds. Like the DLC with grenades added a grenade case asset that spawns near the spawn and lets people without the grenade DLC get a set for themselves. Sniper DLC added really worthless zip lines.
Heist DLCs are generally not worth it if you play solo, as you can just join to an existing lobby, meaning you are just buying the right to host and to get one exclusive weapon and a few masks. In group play you just need one person to be able to host it. So if you are just getting into the game don't pick those up.