I think Cullen is by far the most attractive of the DA:I characters revealed. He's in a league of his own (at least based on my own standards of beauty). I didn't think there was a gap in DA2, though I did think there was one in DA:O.
Well, it's totally a personal perspective thing. Cullen isn't even the most attractive male, to me. I do think he easily fills the traditionally attractive role. I think Cullen, Dorian and Cole are all traditionally attractive based purely on appearance. All of the women we've seen (Cassandra, Vivienne, Sera, Leliana, Morrigan) are traditionally attractive, imo, where as the males also have Solas, Iron Bull, Varric and the warden. Maybe Solas could still be considered traditionally attractive. Maaaybe.
But this is how it usually goes. Tali is the only really unconventional looking female in ME, imo. If you're going to get a frog or bug person, it's going to be a dude. That's where they always get "unconventional" with their designs.