gore, one of the things attracted me to the first borderlands. i liked the whole dark brutal and intressting wastland filled with guns feeling it had, and the gore was big part of this atmosphire
hardmode/onelife mode/more challenge, im one of the people who loved op8. it was optinal and i think its one of the things that keep borderlands 2 alive, i would love see more challenging competetive feeling in the game.
competitive gearbox server with vac and having the option to not play on it, small indie game like dangeon defenders had it. your cahrcters on the server are separate from the charcters you have on your pc, and you can mod as much as you like as soon as you not playing competitive mode. this will be great because it will make the players who want to mod and “tear the game appart” AND the players who wanna play legit and achieve their loot both happy.
more serious story and better humor, borderlands allways had a good lore behind it but its hard to take it seriously when every second sentance of a charcter is “lol-random-meme-trolololXDDexplosionsOfMEATXDDDDDDDD” dont get me wrong, i dont mind some good dark humor here and there. but the kind of random wired humor borderlands has gets old and un-funny when it being used alot.
and thats all i can think of the top of my head, feel free to put in ur wishlists in the comments