RottenTomatoes reviews are coming in now (currently 61% with 28 reviews total)
https://www.rottentomatoes.com/m/terminator_dark_fate
17 Fresh, 11 Rotten
It seems like a lot of them are saying that while it's better than the other post-T2 sequels, that's not saying much, and it's still rather bland and lots of missed opportunity. Many of the reviewers want this franchise to end. It feels tired at this point.