It's' terrible... if they try to prolong it. The "Hey we are both kinda the same and alone" is a reason for THEM to try it, in universe, but it's also the reason why it is ultimately crap out of universe. There are BILLIONS of men and women on this planet that are ultimately the same... but as any of us know that isn't enough. To make it a serious thing would be DC is saying "Superman is by far the most powerful man on the planet wonder woman is the most powerful woman on the planet... so of course they have to be together!" then it's just two incredibly powerful beings super-ing around... doesn't seem like there's any real place for am interesting story to go.
As others have said a much more dynamic story would be Batman and Wonder Woman... if they do it right. They have touched on the idea elsewhere but have yet to make a real story of it in the main continuity. Just like a regular woman can handle a "Super" man a regular man can handle a woman with powers because a relationship is not based on power it's based on how the two people interact. Wonder Woman clearly has issues with men as her ENTIRE society felt they needed to separate from them, and Batman is a very closed off, half emotion giving, half giving a crap type of guy... against that no matter how much power you have as a woman it's useless... that makes for some great story telling, if they'd ever tell it, they did a bit in the cartoon, some in Trinity which was great, but that's it. Besides as also noted, can Bruce have one woman semi-long term (as I don't see Bruce ever settling down) that is not a criminal and be himself with... Bruce Wayne is a facade, Batman is who he is, that's would be a good relationship story you can only get right now with Talia and Selina but can't go to far.. because they're crooks.
At any rate we all know Superman is ultimately with Lois so this will be short lived of course, we'll have to see what they do in the mean time.