Gives access to all the Current DLC (Scarlet Pirates, Sir Hammerlock and Torgue) +1 (excluding the character and the Slaughter dome) I would kinda wait and see if the DLC4 is any good then I may suggest pick and choose if you don't want all of them. There is a hint of a second season pass which maybe better if none of these first 4 DLC is any good.
No offence but this is a bit of a weird description.
On the PC at least, this is how it works:
Season Pass (£19.99) includes:
Captain Scarlett and her Pirate's Booty (£7.99)
Mr. Torgue's Campaign of Carnage (£7.99)
Sir Hammerlock's Big Game Hunt (£7.99)
As-yet unannounced campaign DLC (Probably £7.99)
These add a number of hours onto the game and are extremely good value for money, if not quite as good as the better DLCs from Borderlands.
Does not include:
Creature Slaughterdome (£3.49) - Just a quest chain, five rounds of a horde mode against animals. You do get a new weapon from it though.
Collector's Edition Pack (£3.49) - Exclusive skins, heads and a grenade type which is extremely underwhelming.
Mechromancer Pack (£7.99) - Adds Gaige the Mechromancer, an awesome new class. Also gives you Gearbox weapons (handy at the start of a new game), a free key and that relic which is just crap.
Edit:
So tonight I finally, finally got to finish the first playthrough with Axton. So far I've put all my points into his middle tree so I have a longbow nuke turret and an awesome rate of fire increase kill skill amongst a few other nice things. My co-op buddy decided to carry on when I went for dinner and finished the game, I came back and finished it alone and found a Conference Call, so that was nice (even if it'll only be useful for a handful of levels now). Finished the story on level 32 with loads of sidequests left, we stopped actively doing everything possible when we got to Sawtooth Cauldron. We still have all of Lynchwood to do for a start. I think we'll probably get to level 34 before we even start TVH!
Also I decided to have a nose around on the Borderlands Wiki to see if anything has been discovered (and also to look up what the Evil Smasher glitch actually is). I see they've learned a thing or two about the Fibber.
Assuming the player traded to get those two Fibbers, though I'm sure they didn't, and that's a post-nerf Bee they're using, that's actually completely legitimate. I find that to be crazy and I want that. Terra is the only raid boss I've fought and I've only fought him once.