MegaCorp is a better DLC now than when it was released thanks to some long overdue updates to Stellaris's economy. It provides more and better content than most flavor and species packs, but it and Apocalypse are the weakest major expansions for the game.
If you like Stellaris, especially if you want to play as a megacorporation, MegaCorp is worth buying on sale, after picking up Utopia, Federations, and probably Nemesis (in that order).
I'm not normally into cosmetic DLCs, but I've *really* enjoyed Humanoids.
There are a few reasons for this:
1) The DLC's humanoid ship set has easily the best looking ships and starbases in the game.
2) The voices the DLC provides are underrated and were an unexpectedly enjoyable addition to the game. Since Stellaris already has a great soundtrack, I'm less likely to mute the game and more likely to enjoy the DLC's voices.
3) A large number of prescripted empires use the humanoid ship set and voices. This DLC meshes well with those, which spawn as AI empires even if you don't play as them.
Obviously this isn't as beneficial as DLC that affect Stellaris's mechanics, but I have no regrets about having picked it up on sale.
This is good music, but it doesn't add any new tracks to the game. It only gives you sound files that you can download or listen to outside the game.
Some of these aren't part of the game's soundtrack - it includes all of Stellaris's trailer music, including the fan favorite from the Apocalypse story trailer - so it's not a bad value. However, I gave it two stars instead four because the description doesn't clearly state that this is more akin to a Stellaris-branded ebook than a normal DLC.
This was the most fun Stellaris DLC that Paradox has released in years. It's the most significant update to the endgame since Utopia, if not since the game's release.
The Marauders are a good addition to the game and Titans are pretty fun to use. However, Colossi - the headline feature of this DLC - are underwhelming thanks to the opinion penalties you incur with the entire rest of the galaxy for using them. This has become more true after the game's more recent updates to federations and the addition of the galactic community.
It's worth getting on sale, but Apocalype and MegaCorp are roughly tied for weakest major Stellaris expansions. Utopia, Federations, and Nemesis add more to the game in my opinion.
The best parts of this DLC are the flavor and mission trees for the minor European nations it adds, as well as the three new music tracks (which are some of my favorites in the entire soundtrack).
The mechanical additions - equipment conversion and licensing and Reichkommisariats - aren't as impactful as the mechanics other HOI4 DLCs add.
If you like HOI4 and have most or all the other DLC you're interested in, it might make sense to buy this one on sale.
This is a good DLC but, counterintuitively, its most enjoyable features are for Japan, not China. The Chinese content is good, albeit tedious, as other reviewers have said. As long as you expect the DLC to make China a deeper experience, but only a modestly more fun one, you won't be disappointed.
Obligatory disclaimer to only buy older Paradox DLC on sale.