As someone who loved Deus Ex: Human Revolution - Deus Ex: Mankind Divided is a MUST to play.
I'll keep this brief, with around 50hours played and without a single box and stone unturned in the game I finished with the Pacifist achievement. Yet in the end I did not feel good.
Overall I loved the gameplay, time flies when you play this as it pulls you in if you like to explore. Once again taking the role of Adam Jensen is wonderful but unlike HR, Character development is poor in MD. The story feels short and less interesting than all the points of interest & sidequests the game delivers (which are really good!).
Gameplay is wonderful. It's obvious this will become a triology though. Worh a play but don't expect the same fullfilment as Human Revolution when you finish it.
It is through this game I realise how important Story and character development actually is because everything else was really well made and enjoyable.