I always liked the plastic-y skeumorphic interface with the subdued color palette; personally I'd prefer the modulation colors to be more subtle, but that's super nit-picky.
Also agree there's too much room taken by the modulation - not sure what the static envelope representations are for in what is obviously not a "beginner" synth - leave them out or animate. Maybe NI's planning a "dark mode", in which case those colors would probably work well for either.
I think the knob speed might be a design choice? I don't mind it; a lot of synths are too reactive to me.
Otherwise, it's well layed out IMO, and no issues in Live on Windows 10 (either scaling Live or scaling Massive X).
Don't need to say much about the sound - I think we're past the point where there was even a chance given NI's DSP IP that this would sound less than stellar. The potential for great evolving ambient sounds and soundscapes surprises me a bit, though given the feature set, it shouldn't. But I think the market for this over the original Massive will be greater, though less focused than the previous version (that'd be the wub-wub crowd)
CPU usage is comparable to other synths of this caliber, so no complaints.
Favorite feature - 2 noise generators with the ability to bypass filters. Surprised there aren't more drum presets, especially with the cymbal samples, etc.
Does feel a bit rushed - I think we'll see an update in the coming weeks that will already address some of the missing pieces (for me, missing shift-fine control on the knobs would be #1).

