I'm not able to sleep right now, so I thought I might do this.
You can look at this as a review, just be aware that there will be spoilers.
First thing I want to say about this game is, that it is a lot of fun. I had quite some fun playing the game until the story was over, but after that I had little to no reason to continue playing.
One of the main issues I have with this game is, that it's exactly what most people like, it has the combat from Batman Arkham Asylum, it has the parkour from Assassins creed (Also Ledge and From Above assassinations) it has the identifying your target from AC, and the convenient fast travel spots around the map. It's all someone would want and don't get me wrong, they're good mechanics, they work with this game, the combat is working and mostly responsive (It's mostly responsive to right-clicking, which is counter an enemy's attack, not so with the space-bar which will not react if you're in the middle of a combo and need to avoid an enemy's attack.) and the environment has a nice feel to it.
The nemesis mechanic they're using in this game is a fun distraction and something I'd like to see more often implemented and improved, it basically works like this: If you challenge an Uruk and are killed, the Uruk will grow in power and might get a higher rank in the military structure they have, even nameless Uruks can achieve a title this way. Later in the game you can grab an Uruk on the battlefield and send a threat to a captain/bodyguard/warchief and increase their power this way, just keep in mind that threats also makes the victim gather more Uruks around himself. (I guess they're all male, I don't think female Uruks/Orks/Uruk Hais exist)
The story is okay, it sends you around Mordor to do stuff and keeps you occupied, the main interest here lies by the wraith that accompanies you throughout the game. As you progress with the story you'll learn more about your uncanny ally. The main character himself interests me less, he's a ranger who once guarded the black gate until he and his families are killed by the Black Hand of Sauron, but for some reason (Explained later in the game) you cannot die and are then out to take revenge on the Black Hand. There is a lot of buildup to the Black Hand, Hammer and Tower (I can't quite remember their names, it will be apparent quite soon) but the problem is, that in this case the game works against you. The big bad bosses who are feared in the story and forces your friends to flee.... Are pushovers. No sweat, just go there and kill the guy within a few seconds, really really really easy and this is something I've started to realize with time... The game offers you no challenge at all. Yes there are a few missions where you can fail really fast, but the solution is found even faster (Instadeath moments)
I took about 15-18 hours to finish this game and that is with most of the side missions. The big boss battles are gimmicks and the way you defeat Sauron is by quick time events (Push a certain button at the right time and victory shall be yours) this is a game anyone can pick up and play, at the end you're a god and Lord of the Rings shouldn't even have happened. Also what disappointed me quite a bit is how small Mordor seems. I got the the second half of the map and thought "Cool, a grassy area. I wonder what else they'll offer"... nothing really. There is a lot crammed onto the two maps you have and all of this makes the maps look smaller. When I watched the movies I saw great landscapes the characters traversed and got the feeling that the world of Middle Earth was huge, not so much Mordor it seems. You get from point A to point B really quick, even without a Caragor to take you there.
What I did enjoy was the tons of lore they've built into the game, everything can be read in your glossary and artifacts that you find give some clues to what happened to some characters, nicely underlined with some good voice acting. The voice cast was good, I felt like I heared the characters talking to me and was interested in a few (Everyone lives, do not worry) and rejoiced when I heared the voice of Saruman. The inclusion of Gollum makes sense to me. I just find it odd how every single person behaves extremely hostile towards him, but I guess it's a cultural thing.
Sadly the music didn't quite stand out to me, it's mainly there to tell you what kind of situation is going on, but has little character itself. When action was needed the music played action music, when nothing was going on the music kinda was there, but it never really caught my ear as anything else but generic. I know the game is called "Middle Earth: Shadow of Mordor" I guess it's an attempt to disconnect it from the movies, but man, it's a game in the LotR universe and has the style of the Peter Jackson movies, you cannot really win here with the generic music you're offering. When I think back to the music there are several pieces that stick around "Concerning Hobbits", "Minas Tirith" and "The Riders of Rohan" comes to mind. Yes given, it's easier to make music for a movie since it's a set piece that will not diverge ever and it's far more challenging to compose music that changes with the actions of your characters, but yeah, some more investment in the music would've been appreciated.
So wrapping this up or TL;DR: The game is fun and imo really easy. If you have nothing else you want to play and are looking for a nice distraction with some "new" (Maybe or maybe not, I'm no expert) lore on the Lord of the Rings universe go and pick it up. I had fun with it and surely so will you, just don't expect it to be as epic as the movies