Worth it for this feature if on sale, and even if its not, go ahead and get it.
You wont regret it.

Not needed by any means, but does add a couple nice mechanics and plenty of flavor to the game. Worth it for fans and casual players, but I'd recommend waiting on a sale.

Doesnt add much to the game except from a narrative point. Not really worth it to me but others may enjoy. Preferably buy it on a sale.

Pretty nice Defense type game, just watch out for the DLC practices, they are worth it on a VERY deep sale

This DLC and the patch it comes with (2.0) were a big step forward for Stellaris, and in addition not too many features are gated behind a paywall, DLC is worth it on sale or not.

Don't let the graphics turn you off, this game is worth it at any price, the modding community is fantastic and rivaled only by a few others,some people will say to play the game unmodded first and I mostly agree outside of a few minor mods like Diplomacy and battle sizer for larger battles. Making the game even better, you don't have to have a top of the line PC to enjoy it,can't wait for Bannerlord, and remember there is a mob for everyone for this game,Praise King Harlaus and long may he feast!

Features locked behind a paywall again with the DLC content being pointless fluff while the base game and AI especially still have significant issues. Wait for a big sale or pass.

Expands the middle east area greatly, if you have no interest in playing there, pick this one up a at a deep discount, if you are interested in the region, a must buy, even if the price is too much.

Pick it up on sale, the game is patched so now you can toggle off conclaves worst features, and get access to newer mods.

This DLC adds in plenty of new content, not just filler content though there is some of that. My recommendation, wait on a sale unless you're dying to play the game with eco-friendly techs, etc.