I didn't really care for it - him asking her out is really awkward (what's Wanda going to do, say "no I'm not comfortable with one of my friends dating you" right there in front of the entire Avengers team?) in a way that never really gets dealt with. It seems like we're just meant to take Wanda's statement there at face value. And Carol's "oh hey suddenly I'm intrigued" just feels kind of arbitrary - I guess they shared some interesting moments off-panel?
I wonder if that's just me, though, because thinking about it now I can't recall a single canon Carol romance I've found at all interesting, and only one I've even found particularly convincing.