Certainly an entertaining watch, with fun performances, fantastic visuals, & that classic RTD build, & the Omega reveal did get a reaction out of me - score one for Bluesky's muting functionality for helping me stay unspoiled (I will never understand the need to know what's coming; surprise is a huge part of the fun, for me) - but I have to agree it's hard to rate the ep given it was 95% setup, & at core something we've seen so many times now. Ultimate reset button incoming, quite likely!
And yes, I too have concerns about just how much remains to be resolved in a single episode. Makes me wonder if everything will be, if maybe some things will be left for any future series/specials.
Side note: the book Conrad was reading from looked very much like the original Harry Potter covers. Subtle, RTD.
Oh, and I'm 48, and my first Who encounter was not a positive one, as I likely have mentioned before. I believe I have Colin Baker's first series to thank for that. Obviously, my opinion has since shifted.
We had the A Team on the other side in those days, then it was scheduled on weekdays when kids would be out at after-school events and up against Corrie. It’s a wonder any of us saw seasons at all by the end xD (I really count my regular viewing — rather than reading World Anuuals and Target, as starting with season 25 when we could finally tape one channel and watch another in my house lol.)

So, here's mine. 66 and first encountered Who in the form of Peter Cushing. Shortly followed by Tom Baker. Both on TV.