Repetitive gameplay, no story, poorly drawn characters that you don't care about, repetitive copy-paste enviroment, stealth/cover based shooter only pretending to be rpg, dull, unintresting dialogs, tiny lore not incorporated properly into the game -just notes that you can read or not; you don't need them to progress at all.
I guess Deus Ex HR is still better than most of what is made nowadays but if you expect something mature and interesting it's just not up to it.