Honestly, I dislike veto power greatly. Unless there is something dangerous in the mix (see BU's number 2 as some examples). I have seen what it can do to people, and unless you have control of your own relationship, it will never ever be relaxed or stable or even fun. At some point you have to be trusted as an adult, to manage your own shit. Otherwise, why are you getting involved with people?
People believe veto power can only come from a spouse saying "no this isn't happening" But how is it different if there is no veto power on the table but the spouse acts like a lunatic and it ends. It isn't...
I would outright refuse to get involved with someone who has veto ability. Its not worth my time to be involved with someone who doesn't have control of our relationship.