If I could give 'Mixed' review, I would select so.
Nonetheless, it's only good or bad, and it's sightly more negative aspects than positive.
TL;DR at bottom.

As you can see right away from the pictures and trailer, this is a DLC that will allow the player to create industrial areas based on the resource they're located on (ore, oil, farming, and forestry), create extractors, processors, warehouse, etc etc.
Just read the DLC description.

Sounds great in paper, but it's poorly applied in-game.


See, if you have used the vanilla 'resource industrial district' in-game, you will notice right away that resources deplete over a certain period of time, more likely than not a single factory can consume its resource underneath in less than 5 years.
So, after the resource is depleted, they're nothing but a waste of water, electricity, and area, so you remove them.

Now, carry and apply the same example onto this DLC, and it will be exactly the same:

1. Ore and oil industrial areas will not last more than 5 years, most of the time they will be out of service before they even reach their max level.
   
2. The DLC adds 'Unique Factories', which are specialized factories that use materials to create luxury products. Most of these factories require materials from multiple resources, so you can have forestry and farming ready to go, but oil and ore will not be available for you.
   
3. Addressing the previous point, importation is a possibility, but more likely than not you will end up creating a greater traffic congestion in your city due to the amount of trucks from outer cities coming in.
   
4. The point of the DLC was to address this problem, to have the city create its own resources independently and reduce dependency of importation, not open up even further the wound, requiring more importation to supply these Unique Factories.

"I had to enable unlimited resources"
I do not encourage the usage of cheats, such as unlimited money, instantly unlocked buildings, or for the most notorious on this review, unlimited resources.

Cheats remove the sense of accomplishment of creating your beautiful city from nothing but 60,000$ and for you to say "damn, I build this" with a sense of pride. You managed to survive the many demands of the city, natural disasters, and death waves that struck your city.
Not only does this allow the player to feel more engaged and careful with this money, but also to be more careful with his decisions, allowing for a longer gameplay.
With cheats? It's just a playground. You are given everything, mess around, get bored because there is literally no challenge opposing your way, and then you get bored of the game and never play it again, despite the fact you didn't play the game, but rather a cheated version of the game.

This applies to this DLC. More likely than not you will find on the Cities Skylines community forums giving their opinion on this DLC saying "well I had to use unlimited resources because they ran out so quickly", and it is true, most of the screenshots used as demonstration on this DLC are very likely to have been created using unlimited money or resources.

Last time I tried twice to create an oil and ore industry, less than 5 years pass by, they're out of resources and now there's a heckton of trucks coming to my city to supply my Unique Factories.

If you have to use cheats to make a DLC functional and enjoyable, it is not a good DLC.
The reason I wish this was a mixed review is because, if you accept the lack of challenge, you can buy the DLC and enable unlimited resources, but will you actually feel rewarded?

We all know and hate how bad the navigation paths of vehicles have to be, so bad that we have to hold them by the hand and create an unnecessarily oversimplified intersection or else they will gridlock horribly.
Well, the AI is back, and now with something you cannot fix like you did with roads.

I've experienced so many times that I've lost count of about how my processing factories (the ones that take Raw Resources and convert them into Resources that then will be consumed by the Unique Factories to create Luxury Resources) will demand for Raw Resources, despite the FACT THAT THERE IS A WAREHOUSE WITH FULL CAPACITY OF RAW RESOURCES, RIGHT IN FRONT OF IT!
I click on the factory to see routes of vehicles, and I see a truck from many kilometers away coming in... why.
Why is this AI logic so horrible.
I've let the navigation paths of AI pass by for the most part, but this, this AI will make your experience frustrating because no matter if you have all four buildings (extractors, processors, warehouses, and unique factories) right next to each other, they WILL complain about lacking services that the building right next to it could address... but nooo, you gotta wait for that truck kilometers away.

You can still have fun creating your farming (map designated) and forestry (you can create your own by placing a lot of trees), but that's still a poor offer because you don't get to experience the true potential this DLC has.

You could have had the chance to have all four industry types, but all you can use are two of them, thus less than half of the DLC content.

Oh yeah, there's also post offices, but they're nothing but extra happiness for your city. Talk about powercreeping the game, now that with all these past DLCs, having a happy city is easy as 1-2-3.
Warehouses are also a thing, but never had a chance to use them because the resource specialized warehouses did the job.
Cargo Airplane (& Hub) are okay, I guess, definitively a game changer if your city lacks railroads and/or sea routes, aiding to keep trucks inside the city, rather than having to import and export through land, thus traffic.
My city has railroads and a sea route, so this was barely significant.

The Industries DLC is an amazing system that unfortunately was applied under Cities Skylines' horrible resources mining system.
Feel free to buy if you are OK with enabling the Unlimited Resources cheat to have the full game experience.

Definitively not worth 14.99$, wait for a sale. Minimum 9.99$

I saved the fish!