Im playing through Borderlands: The Pre-Sequel.
I played this one when it came out, but haven't touched it since. Which means that I have also never played the single DLC mission pack that was released for the game, which I've heard was pretty good, or any of the DLC characters.
For those unaware, the PS is effectively a standalone expansion of Borderlands 2, and is (as the name suggests) a prequel to BL2, but a sequel to BL1. As for the game itself, It looks the same as BL2. I plays the same as BL2. It reuses a lot of assets as were in BL2. The setting, characters, story, etc are all original, but this is very much so built on the bones of Borderlands 2, very much like what Halo 3: ODST is to Halo 3.
The gimmick here is twofold: one, the game is set on Pandora's moon, and so comes with all of the trappings of that kind of setting - like low gravity, oxygen management, and a slightly more sci-fi tone. Secondly, basically everyone is Australian for some reason. And hey, it works for me.
Owing to the change in gravity, there is a lot more verticality in the mission design this time around. Whilst you are in midair, you can effectively glide at the cost of some oxygen, or you can do a ground pound for some AOE splash damage. There is also a new Cryo element that some weapons can come in, which allows you to slow/freeze enemies in place, then smash them for some serious bonus damage. And there are also lasers, which can be varied in their function, working like assault rifles, beam weapons, shotguns, or railguns.
Is the game as good as Borderlands 2? The gameplay probably is, but the writing isn't quite as funny. It is also pretty unnecessary in the grand scheme of things, because it doesn't really do too much aside from give you some extra backstory to Handsome Jack, and a few of his Lieutenants that you would kill over the course of BL2. But, as someone who has played through BL2 a dozen times over, it is quite nice to have a BL2-adjacent experience, that isn't burned into my retinas at this point.