The character design for enemies. They've done so well in making different types of hive, fallen, vex, cabal and even the taken.
Scenery is top notch too
Impossible. Everything has been complained at least once. Weapons, subclass, class/character, kicks,error codes, raids, nightfall, trials, iron banner, crucible, strikes, loot, exotics, rewards, xur, strange coins, exotic engrams, armour and weapon parts, material grind and cryptarch. Need I say more ?
The art. Design.
Guardians look badass and do badass stuff.
Mechanics are 10/10.
The worst part about destiny is activision, hands down.
Also the grind. The retarded ass grind.