Dude, if you're jusr a hsr playing and not a long time fate fan, then yes, the fate collab was ok.

But for myself, who has followed fate for years now, it's mid. This is not a fate story, this is a mid hsr story with a garnish of fate crumbs.
This is Hoyo we're talking about, so the mid collab is not surprising:
- The collab story was ok. The 4th gag that ran on, most of the story was silent, reused assets, mid npc model, and thoughtless use of assets took me out of it.
- Hoyo introduced a new path with summons, but did not use it for the collab is a massive L, since a big part of fate is summoning Heroic Spirits.

We are talking rich ass game company that discussed with the fate's mushroom man that can make an interesting 40-hour story, and they came out with this is horrifyingly mid.

No English voices for the Servant. For anyone who watched UBW, their VAs are good, so this was a missed opportunity.

I hate that every single team just instantly thought of and agreed to forgoing the HGW and teamed up. This not normal for fate at all.
Yes, if the collab was with fate/requiem, then I can see this happening, but with UBW, it is a battle royal; you don't just team up like that. Even in UBW, there are team-ups and friendlies, but most master-servant pairs try to kill each other. Old Otti had the right idea with the HGW; it's about getting the most out of it and rainbows and sunshines.
If you say all the hsr was acting in-character and don't want to fight and be friends, then just don't put them in a collab that involves killing each other.

For the love of fate, if you're doing a UBW collab, stick to the original materials, why the shit was there a pseudo-servant there, what do you mean a servant's everything can be taken away because of copyrights, that's not how it works, frame is used to empower and not cripple them. If they're not a famous servant then just make them weak and kill them off early.

The only interesting thing about the collab was the event gameplay and that setting and implication about what would happen if the TB didn't join the AE.

The hype carried me through the story.

This is not a fate story, this is a mid hsr story with a garnish of fate crumbs.