I wouldn't let that discourage you. If you enjoyed Diablo 2, then PoE is the spiritual successor to it and it would be a disservice to yourself to not try it. I would echo what u/Laue said and follow a build guide. Follow guides and try to find what play style you like the most. There's so much build variety that it's a truly creative experience. This update is introducing a large component to increase build creativity/variety.
I played a bit of Diablo 3, but honestly stopped playing it because it's not a fun game for me when single player and I didn't know anyone who actually played it this side of the Atlantic