Season pass, mecho-psycho packs, arena of slaughterblah-blah-blah is my choice.

Borderlands 2 Season Pass, Borderlands 2: Mechromancer Pack, Borderlands 2 - Psycho Pack, Borderlands 2: Creature Slaughterdome, others are just skins, but I bought them too for my Mechromancer character XD.

The only dlc worth your time is the last one. Tiny tina's attack on dragon keep, get that, and if you want level 61 it's cheaper to buy that one dlc and that pack.

I don't know because i can't get any copy in steamgifts, sorry.

is it possible to play with 5 or 6 players with the new 2 characters?

Just the season pass is needed to "really enjoy it", the other dlc characters aren't, unless you really want them. And the skins are only cosmetic. The Creature Slaughterdome is boring and short and not worth it.

Season Pass Mostly. Slaughterdome it's good if you want some extra xp. Mechromancer is ok if you don't want default characters.

I pretty much enjoyed all the story related DLCs.

Right when I went to buy the season pass after waiting for it to go on sale... not enough money. And I can't put my paycheck in until Monday. Goddammit.

I have 0 dlc and I simply love the game

I really think Season Pass DLC's are better than the game itself.Awesome bosses, great loot, funny dialogues, new enemies and awesome new places.I suggest you to buy it.

Tiny Tina's Assault on Dragon Keep is easily the best campaign DLC, though for the price you might as well get the Season Pass. The Psycho is my favourite character so if you want to grab one (or both) of those, they make the biggest gameplay difference.