You can purchase the Eternal Collection - everything above plus the Necromancer class - for $39.99 USD. You can purchase the Battle Chest - which includes Reaper of Souls and the Crusader class - for $29.99 USD. You can purchase the base game on PC for $19.99 USD. Eventually even the 17th one will be easy, but by then you’ll be doing Greater Rifts, which have a separate difficulty scale, independent of game difficulty, and go on (effectively) forever. The game gets much harder when you reach the endgame. Finally, the Greater Rifts are time-based events and require speed play, so as a whole the game feels much faster paced than Path of Exile. If you play the games the way they are intended, Diablo 3 is simply the far more twitchy game.
Check “Run this program in compatibility mode for” and set the value to “Windows XP SP 2/3” Is Path of Exile better than Diablo 3? Before launching the game, right click on the game’s shortcut and select “Properties”, then select the “Compatibility” tab. Here are the steps to take to remove lag and other strange issues with Diablo II LOD on Windows 10.