This is a masterpiece.
In my opinion Exodus is the best Metro game with a unique crafting system and open world map. Despite the previous problems with the game release, Steam version is stable, with working DLCs.

Main story:
Great atmosphere with interesting Seasons(maps) In which you will experience many interesting situations.
Main story has 2 endings, depending on your behavior against enemies. Playing this game with RTX functions on will make it even more fabulous.

Two Colonels:
True Metro-like experience. Cleaning tunnels from monsters with flamethrower and finding out what happened behind Novosibirsk.

Sam's story:
Semi-open world in which you are sailing a boat and shooting bandits. This DLC seems a bit unfinished, when travelling through map, you may find incomplete buildings, glitched entities and with luck you can also glitch yourself into boat.
Sam's story also features two endings. Both of which are... mediocre.

Final words:
If considering buying Exodus, don't be afraid to take the Gold edition, with all DLCs.
Both DLCs are at least worth playing.