I hope you folks like Requisition packs from Halo 5 or the loot boxes in Overwatch. Especially the latter.
Why? Because GoW4 has these things called Gear Packs, the same sort of thing, rarities and all. It's the only way to unlock customisation (besides pre-orders and such) in the game and of course it's random drops. Get them in-game or pay real money (micro-transactions) for them. I also think that it's possible to get duplicates in this game too, much like in Overwatch.
So keep that in mind folks. This game has a paid DLC (season pass) AND micro-transactions. I might have accepted it, if the DLC was free like Halo 5 or if this was a free-to-play game. But this is the bad kind of micro-transactions where you can't outright buy stuff, you only get a chance at it. I can already imagine people pouring hundreds of quid on this and never getting the drop they want. Because of this, I've decided I no longer care for buying this game. I always felt that Gears of War 3 was the last one, looks like I'll keep that feeling going.
Enjoy folks.
Edit: I'm making the point that I don't like this nonsense by voting with my wallet. It's a darn shame what has happened to video games these days, the immense greed of some publishers