What a joke of a release. Like props to the artists but the actual release is shit. Server issues constantly, less functionality, less reliability. Straight up cash grab money hungry shit. Nonfunctional communications, it's a pretty big wash. Not saying Vicarious Visions didn't put out a solid client when they had to, more so activblizzard is making the same exact mistakes as the company that first acquired d2 did. SAD to see a classic game get RIPed so hard. VV implied in some statements they'd actually like to work on the game but it seems like their boss sucks ass and I don't doubt it
I'd say the main two features are the end-game map system and the corruption modifiers. The new end-game is a simple version of PoE's - drop maps, roll them, run them for profit. It adds a little more depth and replay-ability compared to LoD's baal/cow/pits spam, and the corruption modifiers add a new level of customisation/'chase' gear to go for. Other than that, there's plenty of bug fixes, balance patches, new skills/archetypes, tonnes of QoL (like being able to stack runes/pgems), increased inventory size etc. Plenty of stuff that would be annoying to play without now I've got used to it.