Two things make or break MMOs for me: combat, and inventory management/UI.
I really like the ornithopters I see in the second trailer. Awesome. Everything looks good graphically except protag who's pretty muddy or potato, weirdly. Combat looks fine (plus points for flamethrower) albeit foundational; want far crazier particle-effect something something abilities.
Tried to descry some menuing and it looks alpha build, which I'm hoping is what it is and not an area they've moved on from developmentally.
As an OG Warframe player, selling your base blueprints to other players for P2P economy is great in fostering community and extending lifecycle. I'm always impressed by what gamers' imaginations + grind can deliver.
Cheers, Slobs.