Played a bit, I'm flabby at CoD these days so I can't properly assess it like others can. I will say that I do like what they're going for with the more team-oriented specialists. Problem is, COD was never really the series for that so I doubt they'll execute that vision with BO4.
Also, I've been getting into BO3 recently too and this game doesn't seem like THAT much of a step up. There's improvements sure, but right now it just feels like Blacks Ops 3.5. It just comes across as.. uninspired. For Treyarch's sake, I hope Blackout mode manages to be their saving grace for this game.
That cursor navigation and long wait times between matches needs to be gone ASAP. No excuse for those design decisions.