My oppinion on the topic, and a bit of adding to your reasonings some places where you missed something:
8. Yevetha/Duskhan League: They really are the weakest of the Factions as it stands, though they got the Boarding Shuttles and their Hijackers to make up for their relative weaknesses.
Their hero roster had been cut seriously from what was planned thanks to lack of resources, as well as their unit roster. They should have got 7 to 8 heroes and the Sorannan-class as a hero unit, but we ended up cutting the class in favor of getting 2.2 out sooner. I myself have spent countless hours to try and expand them where I could, but as you may see, there is not much to work with.
7. Zsinj: Zsinj is actually a well rounded Faction which has very good units, but lacks real impact. I agree with his placement on the list completely.
6/5. Eriadu Authority/Pentastar Alignment: They are very viable factions actually, and to be Honest I think it is a tie between the two. They are not OP, but I definitely think that they both have very strong unit rosters and most importantly, a very very good starting position for the PA. If you manage your economy well, they are capable to be an economic powerhouse by week 30, and with the SSD and the heroes coming in week 20, you are also able to start expanding exponentially. For Eriadu, the starting location is a bit off, since you are getting into conflict early with the NR and IR, but it has a very viable expansionary policy which can cripple the NR early on, and solidify their holdings, which in turn gives them a very very strong holding over the galactic south, and if you start turtling in at that point, you can become a leading faction.
I think they should be in 4th place in a tie, to be honest, before the IR but behind the NR.
4. New Republic: I think they should be moved up to place 3 in my oppinion. Their mon Calamari cruisers are awesome, and the power to shields is very effective if you manage it correctly. The strongest hero roster in the game, good economic bonuses with said heroes and they get the Jedi as well. Especially strong on the ground, but not half ban in space either
3. Imperial Remnant: This is my largest difference in our oppinions. The ir should be in 5th place(since 4th is a tie IMO). They start OK compared to everyone else, but their territories are scattered in most GCs, and hard to defend. Even though you have some of the most powerful ships early game, you can't really take advantage of them since your economy is not the soundest, and you have to make serious investments in your army and fleet if you want to protect yourself. Later they become better, but the NR and EotH becomes better as well, so this kinda nullifies the advantages of Era 3.
2. Maldrood. Pich perfect. You hit the nail on that one.
1. EotH. Just like maldrood.
And just to compare, I will write down my personal favourites as well:
1: Imperial Remnant
2: Pentastar
3: Zsinj
4: Duskhan League
5: EotH
6: Greater Maldrood
7: New Republic
8: Eriadu Authority