Actually there is no reason why a multispecies organization several centuries into the future should follow the ranking system of a one particular earth nation whatsoever.
And there's no reason why it shouldn't - especially when most of the world uses quite similar rankings.
STO is about my Liberated Borg Federation Captain with his Breen 1st Officer, Jem'Hadar Tactical Officer, Liberated Borg Engineering Officer, Android Ops Officer, Photonic Science Officer, Gorn Science Officer, and Reman Medical Officer jumping into their Jem'Hadar Carrier and flying off to do missions for the new Romulan Empire. But for some players allowing a T5 Connie to be used breaks the canon in the game.
Actually there is no reason why a multispecies organization several centuries into the future should follow the ranking system of a one particular earth nation whatsoever.
With minor details like this you want to make it familiar. Everyone generally knows what an Admiral is. Nobody knows what "Ughtar, 2nd class" is. Sci Fi has enough weird stuff in it that you want to make things like this accessible.
They should change Rear Admiral lower/upper to how Subadmiral is on Romulan toons. Subadmiral 1 and Subadmiral 2 are alot better than Rear Admiral lower/upper half.
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With minor details like this you want to make it familiar. Everyone generally knows what an Admiral is. Nobody knows what "Ughtar, 2nd class" is. Sci Fi has enough weird stuff in it that you want to make things like this accessible.