Lets start:
1: Conner, how you handle him? blood magic? sacrifice? kill his mom? get mages? Multiple options and out comes
Ultimately, you wind up with Eamon's support, no matter what you do. How did this choice matter, in the slightest?
2: Elves vs werewolves again multiple options and out comes
...and, you can win the battle w/out summoning either set of troops. How did this choice matter?
3: mage tower: mages or templars who you agree with, companions can also die here and if you choose templars too bad you cannot help connor via mage route and dagna cannot be sent to the circle. Again multiple choices with more consequences which cut you out from options
...and, you can win the battle w/out summoning these troops. Again, how does it matter?
4: dwarves again can you get golems? no geolems? forge destroyed? thaig found? Hell you can make branka kill her self with a dialogue if you do it right. a RPG where we can actually use *gasps* words to resolve a situation.
...and it's rendered completely irrelevant, in that game, by the fact that you don't need the troops, at all. So again, what difference does it make?
5: the entire landsmeet and how it plays out
No matter how it plays out, if you planned on putting Alistair on the throne, he ends up on the throne. The only difference is how much game time you devote to getting him there. If, on the other hand, you'd decided to keep Loghain instead, you can, no matter how it comes out.
All the outcomes also change what you have and their outcomes are visible right there in the game. You want blood mage spec sacrifice connor to get it since as lore says demons taught it to men. Want reaver side with the dragon fanatic cult.
most of your companions could die, killed off due to you choices. Zevran dead, leliana dead, wynee dead, loghain dead, sten dead, Oghren dead too. All of it was possible since you actually had proper choice and their consequences.
I am sorry but it looks like you have never even played origins to even realise why people say it was the best in the series, a RPG series which now is barely one. Even our voiceless wardens had more story and development than the beige inquisitor.
But dont you are dare say the current kids fantasy of a game we got can even compare in terms of C&C to origins and that is why people will always say it was their best game. As a RPG inquisition can barely be called one and its combat is significantly weaker than origins as well.
...and, when I start my next playthrough, I don't have to make a deal with a demon to be a blood mage, if I unlocked it, because it's already unlocked, and the same applies to all specs. Once I have them, they're unlocked. What's more, I can save scum, get the specs, and then reload, and play it the other way, and the specs are still unlocked, thus nullifying the choice in the first place. There are no game making choices in Origins. There are no "Shape the future of Thedas" choices in Origins, no matter who you put on the throne in Origins, they are barely referenced in the subsequent games. They are mentioned, but they have no effect on events, or, more accurately, they have the exact same effect, no matter who it is. It doesn't matter if it's Alistair and the Warden, Alistair and Anora, just Alistair, Anora and the Warden or just Anora, Redcliffe plays out the same way. How does that choice matter, other than the cosmetic appearance of whoever's in charge? That's all that really changes, well, that and maybe who says what if you have both Alistair and Anora?
Spare me the "My choices mattered" mantra. The fact is, they didn't matter. Most of them were irrelevant in the context of the playthrough, let alone afterwards. Tell me, what difference did it make if you unlocked blood mage in Origins for DA 2? Tell me, where was the choice to just let the treaty holders hash out their problems on their own, and contact me when they were ready to face the real threat? Where was my choice, in the Landsmeet, to tell the Nobles that, as a Warden, I'm not supposed to be involved in their politics, so make their decision and get back to me when they're ready to fight the Blight, instead of stroking their epeens? That would have shot a ton of holes in Loghain's position, all by itself, no fetch quests required.