I don't really buy that the act of pining adds to a character's intrigue. Some of my all-time favorite Cap storylines happened during a time when Steve was either happily coupled or single but not really over-dramatizing the pining (The Captain/John Walker storyline came after a break-up with Bernie, but I wouldn't call Steve
pining, especially as he and Bernie remained friends and he even called her for advice on how to deal with the government when they gave him the ultimatum). Waid's recent short run is a perfect example that Steve can do just fine on his own without relationship drama needed to add to the story. And I wouldn't call Peggy a "great love" (like I said, she flat-out divorced him because becoming an
astronaut wasn't ambitious enough on his part for her, because, you know, being an astronaut is such a low-ball profession). That said, I do admit I'm biased against her, I read the House of M tie-in well before CA: The First Avenger came out so it was difficult to warm to her, even in the films.
Honestly, Steve is a pretty young guy, if you don't count the time in the ice, and the thought of a thirty-something year old otherwise healthy guy wasting the rest of his life pining because he couldn't be with one girl is just silly. Part of the inspiration inherent in Steve is that despite being a Man Out of Time™ - aka the world's most extreme case of culture shock and survivor's guilt - he did adapt and even thrived in his new environment. Steve's books have lucked out because most of his love interests have been great. At least they haven't tried to kill him and steal or sabotage his company secrets the way some of Tony's love interests have. A modernized, 21st century girlfriend like Sharon or Rachel just makes sense, because they are trained combatants who can hold their own and thus fit into Steve's world. I'd much rather see Steve with Sharon or Rachel, no matter who they're related to, than pining. Marvel overdoes the pining with their hero-against-hero drama, it gets old.
And honestly, unless you're Jessica Jones and Luke Cage, who are still happily married as far as I know (I don't count Sue and Reed because Sue did cheat and they did separate at one point), relationships are really the least of a superhero's concerns. With their life-style if you didn't know how to move on and live your life when someone close to you dies, you'd be incapacitated.
I guess this is my long way of saying, ugh, pining, no thanks. There is nothing wrong with Sharon. The problem with the films is that Civil War should have never been made to be part of the Cap trilogy, it should have been an Avengers film. I can think of a dozen actual Cap storylines, just off the top of my head, that would have been better representation of not just Steve, but also his supporting cast of characters: Bucky, Sam AND Sharon. Hell, I would have loved to have seen Dennis Dunphy or Jack Monroe, or Rachel, or John Walker, or hell, even William Burnside in the MCU, too. Ah, what might have been.
Maria Hill was all Bendis.
Ugh.