As one of the people who ran Oath at the Vintage challenge- a few observations.
My build was not optimal, and my sleep deprivation did not make for the best of decisions at times.
Lots of cages and containment priests made for a fun field post sideboard. It honestly reminded me of my days of playing dredge in paper- the "does my anti-hate package beat their hate." This isn't a complaint, I actually enjoy that sort of tension/back and forth.
That said, I often wished for a little more removal. Punishing fire might have been a better build for the field I encountered.
The flipside of that is that the Saheeli combo won a couple of games that had my opponent had a turn or more longer I would have lost.
In round three I was playing the shops deck that would go on to be undefeated on the day. I had oath in play, he had creatures. Things were following the "oath has a good match-up against prison" script. Oath activates.
The top card was a sun titan, which entered play on turn three with no viable targets in the graveyard. My draw for the turn is the second sun titan. I have no further creatures in my deck, and not enough mana to play a six-drop. Jazara drops a few more heavy beaters and runs me over.
While this is the occasional price for cheating hideous creatures into play, I'm not sure this current vintage metagame is "loose" enough to have occasions where everything is going according to plan and yet rng just decides it does not happen.
I think the follow up hate-gauntlet post game one makes it where you don't want to just drop an occsional game dur to rng, but this is only my impression.
Oath is very powerful, but I'm not sure things are in a place for it right now.