Shadow of Mordor is so boring, played 2 hours and there is nothing to do. The fact that the game gets even easier as you progress makes feel sorry for anyone who paid full price for this game.
It's $4 at least so I can't feel too ripped off and who knows the DLCs that come with it may be interesting but the base game is lame and half the time you run away from enemies not because it's hard but because it's so simple and easy it actually feels like a waste of time to fight large groups of enemies.
If you haven't played witcher 3 then put that $4 towards it because it's one of the best games you'll ever play. Don't go into it comparing it to skyrim though, skyrims got more character customisation, combat freedom and misc things to complete (the various guilds/ daedra weapons) which Witcher 3 doesn't really have but its story, graphics and sword gameplay is way better.
If you get witcher 3 I would suggest you take your time with it. Don't rush through the story, do as many side quests along the way. The thing about witcher 3 is the side quest quality is the same as the main story so they are worth doing. Best part is once you finish the main game storymode you can play the blood and wine DLC which is arguably more fun and in a better looking world than the base game, just with a shorter storyline