I've played every game in the series for countless hours and continuously throughout my life come back to 2. Playing 4 right now, but I keep finding myself wanting to quit and play 2. Also the remaster is incredibly well done.
You can install the blizzard launcher from the desktop in the deck, add it as a non steam game then do the same thing for Diablo 2 once blizzard downloads it. I forget the actual steps, but I followed a guide online.