Add an new "empire building" mechanic for a truly epic Star Trek experience. A total conversion mod where you can play as one of 5 Star Trek factions with Rebellion 1.82.
In terms of the Federation, Klingon, Romulans, and Dominion factions, the game is fun and enjoyable. The tech trees are well fleshed out and true to the series. However, when you get to the Borg faction, the mod takes a nose dive.
The developers took a sharp turn away from the series in regards to the Borg. In the series, notably Voyager, more is learned about the Borg, notably that they can be beaten by cunning or just sheer brute force. The developers, in their fanboy rage over this, threw out everything that happened in Voyager, including all technology advancements in the Alpha Quadrant, but did not limit the tech tree to pre-Voyager. The result is a laughably overpowered faction completely out of touch with the series.
Unfortunately, this is the only Star Trek mod out there, so Trekkies will have to deal with the fanboy rage present in this mod. If you play without the Borg, it's easily an 8/10. If you play with the Borg, 3/10.
Since I'm a big fan of Star Trek, I would have given Sacrifice of Angels ten points, because it's really fun playing.
But there are also some minor flaws, which I'd like to point out:
#1: No titans. I'm playing SOA with Rebellion, and I really like the titans. Maybe they'll be implented in an upcoming version, if there will be another one.
#2: The Federation is way to powerful after some research is done.
If you're playing a large map, the only opponents you need to fear are the Federatrion and - in early stages - the Borg. Dominion, Romulans, Klingons, whatever are never a match, if your planets are fully upgrated with hangar bays, and Danubes are in place. It's really very rare that you're in need to aid one of your planets with some ships. Some shield- and weapon reducing would do the trick.
#3: The Borg are to powerful in the beginning.
If you start directly near a Borg-AI, it will attack you from the beginning, and you don't stand a chance. In the later stages of the game, the Borg are still powerful, if they have managed to colonize a bunch of planets.
#4: Klingons are imho way to weak. The Klingons are a race of warriors, but their ships cant compete. For example, I've just finished a game in which I put a starbase in a system with a dead planet, and I didnt colonize this planet. It was strategic very important though. The Klingons came wave by wave with up to thirty ships attacking this starbase, and they were always beaten like the dogs they are. Sorry, couldnt resist this reference. ;)
But those are just some minor flaws, which could be easily fixed. After all SOA is a great Star Trek Experience, and with those flaws removed, I'd be happy to rate it 10 out of 10. :)