The first one is still great, a couple visual enhancement mods are nice but anyone saying that you NEED mods to enjoy the game is so full of turd it's not even funny. The game hasn't aged the most gracefully but it doesn't need mods, you just need to get used to how it plays and looks.
If you're dead set on playing them all you should play the worst ones first, Invisible War and The Fall. But imo you should just skip those two and start with the original, and then the newest one, Human Revolution.
"If we can hit that bulls-eye, the rest of the dominoes will fall like a house of cards. Checkmate"