Regarding your spoiler, I was wondering how they accomplished the quantum realm travel without Pym particles...but it's not gonna tarnish my opinion of the finale.
I assume since they're agents of S.H.I.E.L.D. they have access to Pym Particles from a storage room in some forgotten S.H.I.E.L.D. base because Hank Pym was previously a part of S.H.I.E.L.D. and it was a 1970's S.H.I.E.L.D base where Captain America resupplied on Pym Particles in
Avengers: Endgame. Admittedly I wish they provided a quick explanation too, but I agree that it doesn't tarnish the finale.
Although what could've tarnished the finale would be Daisy's sacrifice and revival. In general when a protagonists sacrifices themselves, that sacrifice is cheapened if they're just revived, even when planned. Fortunately though since the source material of the show is from comic books, it's assumed that death is only temporary, especially for Phil "the fact is, dying, it's kinda my superpower
" Coulson.
I'll add I enjoyed that they joined the MCU one last time by using the Quantum Realm, it gave me a fond memory of watching "Turn, Turn, Turn" the week after seeing
Captain America: The Winter Soldier.