I haven't watched the Sony one yet, but I have seen the other two.
Nintendo's was good imo, especially for a system that's on it's way out, there's actually quite a few Games from their Showcase that I would give a shot.
And unfortunately I caught Xbox's, after all of that hype on YouTube and Twitter, and that **** was what I saw.
Ironically AC: Shadows did look like one of the better Games from the Showcase, even if it's clearly being politically agenda driven with the Yasuke character. But at least it had more than grass and mountains, and in a weird way Yasuke kind of stood out for not being the millionth butch woman lead that Xbox Games were throwing out for 90% of that Showcase.
Expedition 33's combat looked well made tbf to it, although again it did love showing off desolate grass sections which I will mark it down for.
Other than that, ****ing run away from western Gaming, because Jesus Christ! That was 1 hour and 17 minutes that I'm not getting back.
Oh and one thing that I can't stand in modern Showcases, is them promoting DLC in a Video Game Showcase, it's kind of in the title.
Ranting aside, here's the videos of all of the Showcases.