The writing doesn't seem great (forced and unfunny), but it's just a trailer, so I don't put a ton of stock in that. Besides, some of Borderlands' best jokes are slow burns over the course of the game or even the franchise, so that might be why it feels a little off.
But the cast...they're going to have to win me over.
Lilith as the lead, I'm fine with. But Cate Blanchett as Lilith I'm a little more concerned about. She's definitely older than Lilith, yes, but that's not the big problem; for me, I just don't think that she has the vibe to pull off Lilith (and I don't think she did even when she was 25). She's got too much gravitas.
Including Tiny Tina in the main cast, I'm over the moon for. But casting Ariana Greenblatt, I just don't see. In fairness, I don't think I can see anybody in particular as that character; she's so singular and wide-eyed, I don't know if there's a young teenager-passing actress who could pull it off. You need the 16-year-old equivalent of Helena Bonham Carter, and she's a pretty singular person. Tina needs to be absoluely unhinged, but in a gleeful way; maybe this could be a Millie Bobby Brown role, or maybe it could be Jenna Ortega (though she might be a bit too sardonic; Emma Myers perhaps?), but I don't know that we have any evidence of any actress in the right age range to pull off Tina.
Not including Brick or Mordecai is sad; I think Dwayne Johnson could pull off Brick decently well, and Michael Pena would've been a funny Mordecai, though it would be even better to bring people into those roles who we've never seen before.
Krieg was kind of a blank slate to begin with, so he's no problem. Marcus, Hammerlock, Scooter, great. Jamie Lee Curtis as Tannis, fine. No major issues with any of that casting. Same with Jack Black as Claptrap; yeah, it would've been nicer to have the original voice actor, but I get that you want somebody with a name in that role and Black is as good as any. I would believe he's played the game, so I trust that he understands the role.
But Kevin Hart...I mean, come on. Idris Elba was right there, and you went with Hart?
After watching the trailer, my opinions shifted slightly. Hart was actually the least of my concerns after watching the trailer; I liked his role in Jumanji, and it seems like he's channeling that same vibe, so I think he'll probably do fine here. And Blanchett's performance as a more grizzled, almost Jane Lynch-ian Lilith kinda works for me.
But Tina still isn't quite right.
All in all, if this had been the same cast in different roles (Blanchett as Captain Scarlett, retconned as a hero? Greenblatt as Gaige?) or the same roles with a different cast (Saoirse Ronan as Lilith? Kiernan Shipka as Tina?) I'd be totally down. The world feels right and the story sounds interesting, I'm mostly just worried about the dialogue and the cast.