Yes, the 3189 uniforms are OK. I rather like bits of them but I'm less sure about other aspects. I really appreciate the effort that went into making the variety of background variations seen in 3x05 (and apparently also in 3x06). I always thought that the idea of Starfleet having only one uniform seemed a bit dumb.
In fact, as far back as TOS we had the standard uniform, the dress uniform and the one-colour utility work suits; TMP had
multiple variations (!) and TNG also had a standard uniform, a dress uniform and one-colour work suits in the early seasons. In the later TNG period, arguably the original DS9 uniform replaced the one-colour work suits as that era's utility uniform. I'm glad to see that we once again again have a variety of Starfleet uniforms.
I do think the multiple re-iteration of the four pips insignia on the captain uniforms is a bit unnecessary. I can just (about) understand it on the admiral's variant but it seems OTT on the others, especially given that pretty much everyone else only seems to have the bumps down the left and side of the transporter badge to indicate rank and no black shoulder straps at all.
Here are a couple of other images from the briefing room scene:
Guys with yellow stripes standing behind Saru. Could be security although we've previously seen Lt. Willa and her team wearing black so maybe just Ops...?
An officer with a red stripe and no black shoulder straps, standing behind the fourth, unnamed captain. The metallic parts of her collar patch appear to be gold like those of the captains, rather then the silver we have seen on everyone else so far. Is that for all Command division uniforms or maybe this is the Executive Officer of one of those ships...?