Things they changed, removed, or made worse: Artifacts. A far superior weapon system. Infusion from any source. Exotics, strike specific loot, and faction packages that were guaranteed to be above our light level. Powerful rocket launchers with tracking and bigger magazines. Machine guns. Why? Just why? Armor perks. Intellect/Discipline/Strength. Fast ability cooldown times. Random rolls. Sparrow horns. A lot of options for private games. Bounties. Daily/Weekly heroic story. Selectable missions/strikes from the director. Good heroic/nightfall modifiers. Sunsinger. 😢 A better Ward of Dawn. Tons of good skills.(Combustion, Death From Above, etc.) Complex skill trees. Mobility/Armor/Recovery adjustments in the skill trees, where they belong. Elemental weapons, and supers don't penetrate shields to get crits anymore. So, now shielded enemies take 2 sniper shots with unmatched elements, and with matched elements, you don't get crits either. The enemy dies from the shield explosion. The shield explosion should come after the bullet has gone through the shield and gotten a crit. The enemy should die from a headshot. Golden Gun is weak without Celestial Nighthawk, doesn't penetrate shields, and doesn't last long enough. Nova Bomb has almost no splash damage or blast radius, like in D1. There's no Shatter or Lance option either. Fist of Havoc is weak. Stormtrance is weak. Grenades and melee are weak. The Shadow shot tether suppression doesn't activate immediately, like in D1. PvP is the worst it's ever been, and it's still not separate from PvE, so the franchise suffers. Infinite use shaders. Sword ammo reserves, and ammo reserves in general. D2 has the Juggler modifier on all the time. Heavy ammo synthesis. The better nightfalI system from D1. Good Scatter grenades. Awesome looking armor and class items. The D1 vendor and faction systems. Raid ships and sparrows. Strike specific loot. Fun. I'm sure there's more.