On my first DAI play I romanced Cullen because of the carryover from DAO, through DA2, and into DAI and I wanted to see how a much fan-desired romance would finally play out even though I was never a huge Cullen fangirl or anything. I thought it was just OK. Then I met Dorian, made a guy specifically to romance him and have no desire to romance anyone else in DAI, ever. I keep playing the same guy over again as I'm quite fond of the character, and despite the variety of options open to me, this pretty much IS Dragon Age: Inquisition for me.
That said, if I ever play another female character, I don't think I will romance anyone at all. Should be interesting as I haven't played a DA game without doing the romance since my very first play of DAO back in 2009.
For DA2 Fenris is my LI of choice and I will continue to pick that regardless of the PC I play.
For DAO... as mentioned my very first play of the franchise had no romance, primarily because I didn't realize it was a thing and never pursued anything with any of the characters. My girl didn't even get ninjamanced by Leliana, which is surprising. Ever since I've romanced Alistair, with a partial Zevran romance on one abandoned play. But if I play DAO again I may not go that route. DAI has really shaped the way I view romances and followers in general, and also the way I view the characters I create. With that in mind none of the DAO romances are appealing to me, so I'm not sure if I will play one again in DAO.