timppu: And what is that? I don't see it listed on Steam page, so apparently it is some US-only thing?
orcishgamer: Steam consistently manages to omit items from their descriptions of the DLC packs, it doesn't mean they're not there. It's not exactly ideal, but usually you can google a wiki site with the complete list in about 60 seconds. The reason I don't recall what it's called is because I bought my last gift of it last summer (bought it 2-3 times as a gift and once for myself). I can't be arsed to look it up. At any rate the season pass contains all the actual content, the extra DLC weapons look cool but functionally aren't terribly important.
Sorry, that didn't really help making it any simpler. What is "actual content"? Some of the DLCs not included in the season pass description seem to offer e.g. extra subquests. That is not "actual content"?
And it seems you know "the extra weapons are not terribly important" from your experience, ie. you have played them? Is it just your personal opinion, someone else might feel differently? Is e.g. double-barrel shotgun in Doom 2 terribly important or not? Certainly the game can be completed without it, but at least I would still rather have it in the game.
I guess I am still waiting for the "Darksiders 2 complete edition" that you mentioned, which apparently is US-only at the moment since I don't see such in the Steam store.
As it happens, I did end up getting something from this sales. KOTOR 1-2, and finally Immortal Throne expansion pack for Titan Quest. I think that's it, don't want to use too much money on rentals. :)