Possibly having them all have a similar amount of content would help them be equally satisfying options, but I'm not entirely sure it's necessary and don't think it's sufficient. I personally am more interested in hearing what specific changes people think would improve each romance - though we've had a fair bit of that on these forums already, and don't expect any new romance content to be added at this stage anyway. Not that I have any problem with discussions that I don't expect to result in changes!
When I think about things that would make the romances better, I don't think about kisses first, but about things that would improve the overall character arc.
In Astarion's case, I feel the "I will always protect you ..." line is not great for the romance, I'd say it contradicts everything said in the scenes before. So having this changed to something with a more suitable spin, preferably something that can be personal to the character you are playing, would be great. An option to gift Spawn-Astarion the portrait Oskar promises you would also benefit the story, I think, as it would give a conclusion of the mirror-plot-line from act 1, as well show the two of you overcoming one of the obstacles of Astarion's condition.
For Gale I would really like some commentary when you take him to the Vault of Sorcerous Sundries/ Ramazith's tower as we approach the Annals of Karsus and all the other wondrous objects. Some better dialogue for Tara in the Lower City and an option to have her eventually join us in camp for a bit, would also be nice.
When you return to the city as Avatar-Astarion, you can have a conversation about what coming home means to you with Wyll. I thought that was a sweet moment and while Karlach and Shadowheart have some nostalgic moments in the city, and Astarion has too in the romance, Wyll doesn't outside of banter. It's for example odd that lady Jannath's cook worked in the Duke's house some time ago and they don't recognise each other.
