It depends on what you mean by "feelings". If a guy tells me he's upset about x,y, and z I will gladly hear it and help him out, and if we can communicate to find a solution, I would call that a successful way to share feelings. I think guys who are in-tune with their emotions are really hot, I love a guy who knows how to really "feel." But feeling isn't just being able to feel happy, sad, or angry. It means to feel an emotion and act on it accordingly, express it accordingly.
So there are successful ways to share feelings, and those who do so successfully I consider "in-tune" with their emotions and are normally extremely mature. And there are guys who just complain and bitch.
Here are some examples, let us discuss a guy being single:
Him: "You know, I've never had a girlfriend and its starting to get me down. I'm 24 and can't figure out why I just can't get a girlfriend. It makes me really upset, and sometimes I think that there might something wrong with me, but I can't figure it out. Am I not attractive? Am I awkward? Sometimes I think I come off too strong"
Him: "I've never had a f***ing girlfriend and I'm 24. I'm still a virgin. It's because I'm ugly and because women are shallow f***s. If I don't get a girlfriend this year, I might as well kill myself."
Sharing your "feelings" is one thing. Bitching and moaning, and saying just general pessimistic sh*t is not showing feeling. If I ran around saying "I should just kill myself because I'm 40 and a virgin, and I'm ugly" then I'm pretty sure you'd want to hear me stfu as well.