I loved Deus Ex Human Revolution, it was my intro to the series and still one of my favs. I woild also recommend something a little more sandbox, like Minecraft or Lightyear Frontier, just for the sheer time sink these games can be. Farming and building can make you lose track of hours at a time, great for travel.

I could also recommend something like Be my Hoard. Trying to get over an hour on a run is a fun way to burn an hour, if you like rouge-lite styles.

If you like driving, something like American Truck Simulator or Euro Truck Simulator is another great time sink.