If you're into setting and story, there is some enjoyment to be had. I dug reading the texts, missives, dialogues, and what have you. The combat is a chore but if you turn down the difficulty you can get through it pretty quickly. (And if you turn it up, it won't be much harder, it'll just take longer, and since it's not much fun, why would you do that?)
Let's get away from the jest that "AoD is fantasy post-apoc and not Dark Ages" because that was merely a joke and another mistake due to poor editing ( never quote in a paper something you haven't read\saw youself, as someone will notice sooner or later or even worse if you admit it). Prob is, there is good writing to be found in Tyranny?
I'll freely admit that I have played only Act 1 and I admire you for having the strength to endure the dreadful combat, but in Act 1 the entire "writing" thing is a bit messy. You can discover the fact that Verse is a spy and get a shitton of loyalty points with her before exiting the tutorial area, after she knew you for roughly two minutes.
Most NPCs are literally walking plot dispensers, always repeating ad nauseum the two-three things we know of the world (the Disfavoured come from the North, they can't read, their Archon cares, they fight in a phalanx, they can't read, they fight in a phalanx, they are better than the Chorus, they come from the North) plus some very light "Generic NPC" dialogue ("I'm Genericus McGenericus The Third, Scion of Genericus the Second"). All the Chorus NPCs can be simplified as 1) Madmen 2) rabble recruited by force. I again point out that the
only thing that got stuck in my brain is the Voices toying with his fourth-wall breaking power.
The Chorus is Caesar's Legion Redux, and having played New Vegas earlier this year I was wondering why they felt the need to rehash the concept. Furthermore, there is little in the way of "moral dilemmas" or challenging the player's morality and choices: in Geneforge, still my golden standard for factional choice, you get options that challenge your own opinions (how power should be employed, responsability, freedom and consequences). Tyranny's writing puts you between red mad guys and blue guys. Worldbuilding by itself is mediocre: this is no Dark Sun, Torment, or even Nethergate for chrissakes.
If in Act 2 and 3 you get some reedeming writing that gives you insight how the bickering Archons are characters and not stereotypes, I'd happily eat my own words: but I did not saw the beginning of an "interesting power dynamic of immortals ruling a bronze age empire". I saw two cartoon villains screaming at each other in a tent with their colour-coded bodyguards.