Anyone has a review on
Middle Earth Shadow of Mordor made by WB
But I will start with TW1 and TW2 :-)
Shadow of Mordor was personally my GOTY 2014. It has its weaknesses and I'd suggest to carefully avoid them by following some rules.
1.) Disable all indicators (counter indicator, stealth indicator, everything off)
You'll need to learn to fight the orks, trusting your vision and experience. No counter-indicator will show you when to block, you will have to watch them.
2.) Never flee from a fight
Not only to raise the challenge - and it will be challenging, fighting 25 orks who surrounded you - but also to make you die from time to time. The nemesis system works best when time goes by. The next one will help with that, too.
3.) If you discover a watchtower and / or when you quicktravel using a tower, forward time
This also helps to let the nemesis system play out over time. The game is easily exploitable if you for instance, just kill all the bosses in one go. Instead, let them fight among themselves, grow interesting traits, make it more interesting.
4.) Don't spam the mass killer abilities
Yes, you get them. By the end of the game you will be maxed out no matter what. And yes by spamming these abilities all fights become cheap, even without counter indicators and whatnot. If you wanna make it interesting and diverse, don't spam the stuff.
I wouldn't say "hold yourself back", that is something that would break immersion, but there are some things one should do that make sense in the lore and just raise the challenge without playing cheaply or let the enemies win.
The core-point is to give the nemesis system room to breath. And if it does, things will work on their own. Interesting enemies will beginn to appear. You will probably get a nemesis who slips from your grasp, survives your supposed killing blows time and again, you will hunt him, yell at him...ah it was such a great game for me. 
But it's really about choice of playstyle here. Yes, after a while you will certainly know how to exploit some game mechanics so good that the game becomes a cakewalk, repetitive, boring. But if you dcide not to do that you're in for a ride. 
BTW: Best part about the game are the fighting animations. It's the system from the Batman games, but with swords, super-brutal and a joy to play and watch. Just writing about now makes me wanna install it again lol. 