Oreimo is tagged as Seinen too, so that doesn't really say anything, since that show is just a guy intending to bone his sister(btw I liked that show)
Also, the problems Golden Time deals with seemed very distant to me, since I had no way to put myself in Banri's position.
Nonetheless, I loved this show, not only for the romance starting in the middle of the show instead of ending with it, but also for it's supporting characters. I desperately wanted to see more Bromance, but that's just a personal preference. The characters are lovable, and the story may be a bit melodramatic sometimes and is not really relateable, but I loved some arcs nonetheless.
On a side note, ToRaDoRa! was written bya the same author, despite that, it highlights the main characters much more than Golden Time and feels a little less realistic.