Oh well....
I would like more options for romances and how they are maintained aswell as how they end up i.e engagement, marriage or children.
I would like to see how a on and off relationship plays out.
A casual fling.
Or flirting with a woman so head over heals over you that she ambushes you while your sleeping at night lmao 
I think the romance could be more engaging and fun.
Especially for a character heavy themed game just like bioware make.
Romances have become a big thing to some fans and could help the company make a lot of capital if used right.
Make them more story oriented or more engaging for the player and there will be generally more positive feedback even if certain other parts of a game lacks abit.
the hardcore shipping fans (just look at shep x liara or shep x tali) will say you laid a golden egg despite bugs and flaws so long their new favourite ship runs smooth lol 
P.S could you imagine making IB your stalker or Sera or Cassandra? lmfao
Cassandra would be such a Tsundere 