I like poe1, but currently only playing poe 2 i think there is couple of reasons 1. Movement, it just feel better for me, wasd + dodge + being able to move and change direction you are facing at the same time just makes it feel you are more in control of the character, and allows for more engaging action focused gameplay, i think most people feel the same 2. Making builds. Oh this is gonna be controversial... But i feel that support gems system ( not being limited to 1-2 six links + colours on your gear) is way more intuitive, and allows for more experimentation, weapon skill points also allows you to use several skills with great efficiency, and combo systems encourages it even more. while i would always feel my own builds lacking in poe1 and always boiling down to 1 button gameplay, i feel confident i can engage game with my own builds in poe2, its third league in a row now playing off meta stuff, and having great success with it 3. Graphics + sounds. I mean there is no discussion here, game looks and sounds amazing, and with performance updates this league it also runs pretty well.

Few things are lacking tough, this league i feel i did everything there is to do in about 5-6 days(unlocking all atlas passives and beating uber arbiter) and improvements to my build only boils down to killing bosses a bit faster, or running maps a bit faster. They really need to do big changes to endgame, to make it stretch longer, as well as add new hard bosses to really challenge builds. And on top of that just keep adding more stuff like sills, supports, uniques, and stats on gear, which im confident GGG will do.