I very much liked the early days of D2 when you had to legitimately watch out to always have scrolls of town portal. Or in D1 when your mana didn't auto-recharge and you had to meter out potions, trips to down for free heal/mana, and just getting in there and doing physical damage because you were out of mana and needed to wait for a potion to drop.
Convenient features always take me out of the world a bit, and stuff where you have to die, try something new, die again, etc to win always makes me feel like I'm actually learning to play better.
Speaking of gear, my fondest memory was a 9 hour camp for my toon’s Golden Efreeti boots. When they dropped I was so elated and so happy with all my friends who stayed that long to help me get them.
It's a game where destroy everything in sight is the correct strategy, you actually get annoyed when they keep coming and coming.
Engaging and fun.
No grind, microtransactions, idiots on multiplayer, just jump in and fuck shit up.