Started playing yesterday, so far I'm pretty happy with the progression system. There's a lot of free game fluff in there too that's a bit distracting, but overall I really enjoy the fundamental gameplay. Every weapon is unique and interesting, and they even have specific combos.
I am disappointed by a few things, namely a lack of classes. Everyone has to be a weapon user, and while each has a different flavor, it'd be really cool to be able to have tanks or healers as well, maybe even a mage class. The framerate also starts chugging the more players there are in the lobby too, at least on console.
They also have a dye and transmog system for their armor, which is very appreciated, and while the transmog requires a currency (that I don't know how to get at the moment), you can change your character's face at any time with no penalty.
Overall I'm excited to keep playing, hoping the game's content keeps expanding.