I played the DLC and it was about what was expected. There's 1 choice you can make, kill the Mechanist (some random girl) or don't, and the gist of the DLC is wandering from combat zone to combat zone and killing robots so you can steal their parts to make your own robot. Like weapon modding, robot making is an exercise in holding the down key till you find the last mod in the list; while the concept of giving a robot axe hands may be appealing, the weapon mod at the bottom is the best and since the game has level scaled enemies it won't ever kill anything if you use anything else. There's a new set of armor that looks like that shitty raider armor but in gunmetal grey, but you'll have to use it because it's better than any other armor, that ugly Mechanist suit, and 4 new weapons (a chain lightning gun which is alright, an Assaultron head that can one shot pretty much everything but gives you rads for firing it, and an Assaultron blade and Mr. Handy buzzsaw that are both useless because melee weapons are worthless and not fun in Fallout 4). Your new robot companion, Ada, has as much personality as a rock and the Mechanist is a autistic girl who sent a bunch of heavily armed robots with the brains of death row inmates into the wastes unsupervised with the vague goal of "save people", and of course they do that dumb shit where they just interpret "save everyone" as "kill them because post-apoc life sucks" because wow this has never been done before ever.
This DLC is Bethesda's design philosophy personified: its gimmicky and has no real substance, its full of mildly exciting combat, its dismissive of any attempts to roleplay outside of a single set path, it's obsessed with collecting junk to craft shit, and its entire purpose is to swindle people. I guarantee if they had released the GECK when Fallout 4 came out this DLC would have been made by some average Joe's and those modders would at least have the courtesy to not waste my time (and theoretically money if I were somehow to take massive brain trauma that rendered me incapable of downloading torrentz) with a worthless plot.
god why did I play this again, I must be fucking stupid. 1/5, the best thing I can say about it is that is functioned.