As a comic fan thats an interesting take for me to see someone use. Wanda and Vision have had a long standing comic relationship. It was decently done for the movies and wasn't an "out of no where" romance. I was expecting it and wondering how they would do it.
The Banner and Romanoff to me was indeed the odd romance but I also thought it worked given one particular line where she says, "He's not so bad. He has a temper... deep down he's all fluff. Fact is, he's not like anybody I've ever known. All my friends are fighters. And here comes this guy, spends his life avoiding the fight because he knows he'll win."
That mindset made it work for me in the end.