Just finished the prologue campaign, maybe a little rough round the edges, but overall It looks promising.
Part of that is probably trying to cram all the events of the Fall of Cadia into it, and making it a tutorial at the same time.
The worst offender is the "Battlegroup Silver Dawn"-segment in the end, which they have done in-engine. There is some good cinematography there, but it is way to busy in its visuals (too much on screen at once).
As for the game itself, from the Beta you can see it is an improvement with regards to mechanics and graphics. Everything from the first game is more refined.
The diversity of play styles across factions and builds is amazing and very, very welcome. (Let's hope they manage to balance it.)
There are remaining issues in PvP however, like the lack of a proper pregame lobby for final adjustments to the kit you go into battle with (just limit it to 1 perk change, for balance). 1v1 also still sucks, despite ability spams having gone the way of the Dodo bird diverse fleets still seem to be a losing proposition no matter what.
There are also still a number of balancing problems* and a few bugs (e.g. the Aeldari Maelstrom ability does affect shielded ships despite the tooltip saying otherwise). Most of those, esspecially the stability issues in during matchmaking, are hopefully sorted out by release.
*Too bad most of those are returning issues, looking at you, Druhkari with Accelerated Batteries - aka "Hit and Run Fleet getting range boni breaking the hit and run-concept" - and perked-up Necron Solar Pulse - aka "lack of a telegraph makes powerful ability a win-button". Used to be the problem with Eldar Pulsars and the Nova Spam repectively in the first game, so why did they make a return???