Yes, yes, I'm replying to a 2 year old post. I'm old and senile (and the internet is forever!), I can do that.
I do wish there were more successful adventuring couples, out there. The old Hart to Hart TV show comes to mind, or the married-adventurers that were Ralph and Sue Dibney, or Reed and Sue Richards, or Mr. Miracle and Big Barda, or the Hawk-peeps, back in the day.
Most of the power couples in comic books have either been sidelined (Reed and Sue), split up (by death or divorce, Vision and Wanda, Ralph and Sue Dibney, Clint and Bobbi, Scott and Jean (or Scott and Emma), Hank and Janet, Dick and Kory, etc.) or otherwise are no longer relevant. (And I do prefer 'power couples' to a situation where a super-person and a non-super-person are together, as it's more fun, I think, to see them on-panel together, and neither of them having to be sidelined while the other is out adventuring, as is sometimes the case with a Lois or Mary-Jane or Kyle Jinadu or whomever is the non-powered-half of the couple. I prefer stories where Mary-Jane or Lois have some sort of powers, or at least action-adventurer-y reasons to be in the thick of it next to their super-spouse, even if some of them do hold their own and aren't 'built-in hostages.')
Gah, and now I have the horror that is Terry Long (non-powered husband to Wonder Girl/Donna Troy, of the Teen Titans) stuck in my head. There aren't a lot of characters that I can say that I'm glad they're dead, but he's one of them.
There are a few, like Black Bolt and Medusa, or Aquaman and Mera, that seem to be making it work, and books like Renew Your Vows and Super-Sons suggests that
there might finally be a bit of a turning point going on, where the big 2 are willing to experiment with (AU versions of, at least) big-name heroes in long-term marriages and / or committed relationships.