This dlc adds the ability to walk on planets with an atmosphere, except earth-like and water, respectively, as well as a lot of content for explorers (all sorts of plants) and mechanics shooter and interaction with the settlements.

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I'll indicate the pros and cons right away. From the pluses in my opinion can be distinguished:
[+] Walking, namely walking around stations, settlements. Yes, the community expected walking on ships, but unfortunately the developers have done otherwise.
[+] Explore. New plants, their visuals, effects (negative and positive for the pilot). Of course it pisses me off that you need 3 fragments of this plant for a complete collection, because sometimes the search for this plant takes a long time (yes yes bacteria, I mean you).
[+] Graphics. I got the new visual component of the game, especially the coloring of the atmosphere of the planet, depending on its composition, more detailing of ships, reflections. But the optimization leaves a lot to be desired. In the settlements, I personally do not get up to 60 frames per second (you can see the extended specifications of my pc in my profile), and this is bad, most of the negative reviews on Odyssey is because of the optimization and it is a problem of the game, not the hardware. I hope by the end of this year they will do everything, I wish them good luck.
[+] Interaction with the settlements. The addition of the cutter, pilot scanner, suit charger diversified the game on foot and gave the possibility of any interaction with the settlement, a kind of sandbox.

So, now the minuses of this add-on:
[-] Optimization, on the account of her above I have already described everything.
[-] Again grind! Adding new materials, data led to another wave of grind.
[-] "Another" new content. Developers think that the community can be fed content in the form of skins on weapons, costumes. There is nothing new, except for some logs (messages), abandoned settlements, which do not solve the existing issues on the lore of the game, but only confuse even more, but that's a flaw in the game itself, not in the add-on.
[-] Bugs. Well, without this any game can not do at the start. They are, they are not a few, I hope the developers will fix everything.

In the end, I will say this: I recommend this add-on to any pilot, because it adds a lot of content that adds variety to this great game. Fly safe CMDR. o7

UPD 05.08.21: Yes, I tweaked the review a bit.

UPD 07.05.22: After the release of update 3.17 in Star Citizen, it seems that the optimization in Elite Dangerous just scored, this is purely my opinion. But judging by the roadmap, the optimization should still be tightened.