Great Chemistry between the leads
The Falcon and Winter Soldier was touted as being a buddy cop series, which turned out to be a complete misdirect. Somehow the chemistry between Sam and Bucky was non-existent, despite the two already having shown good chemistry in a few scenes in the movies.
Sylvie and Loki had awful chemistry, and so did Shang Chi and Katy.
The only good pairing has been Black Widow and Yelena, which was one of the few redeeming qualities of that film.
Judging by the trailer they hit it out of the park with this one though.