I've only done one of the romances myself, so far, but have watched the majority of others on good old youtube.
Cullen (my one romance) is definitely a knight in shining armour kind or romance, with lots of very sweet scenes, good pacing throughout the game, and good interaction. His romance feel like it has a future 'after the game', and you never feel like the Inquisitor and him are going to break up. The game makes them a pretty solid couple, and they very much are just two people who fall in love and stay in love, with no 'real' drama. If you're playing as a mage, it gives the relationship a bit of a 'star-crossed lovers' feel, due the the ex-Templar aspect. Also, their first kiss made me do a mega fangirl swoon
If you like a good angsty/dramatic relationship, this is probably not the one for you, though...
In regards to the Blackwall romance, while I did enjoy some elements of their romantic story (his passion in certain scenes, the end of the redemption arc), his
left me feeling cold, and I guess their scenes just feel more 'drama' filled, instead of romantic. Haven't heard any party banter regarding them as a couple, so couldn't comment on that.
I've liked all of Bull's romance scenes I've seen, and have no problem with the 'BDSM stuff'. It gets truly sweet in the later stages of their relationship, and I've heard bits of good banter. It just depends if you're comfortable with some of the more explicit 'talk', and with the romance starting out as obviously more casual than some others.
As others have said, the Josie romance is the epitome of 'Disney Princess'. Very sweet, very sugary, but feels very on the surface IMHO. Doesn't necessarily feel passionate to me, but I've not played it though. The
scene is great fun though, and I can guarantee that she won't break your heart
Can't give my opinion on the Solas romance as punchy feelings.