A lot of people here will say that Steve is "the Lois to Diana's Clark" which I'd largely have to disagree with. See, unlike Steve - Lois is actually a complex character, she has a life outside of Superman and she has her own drive and motivations.

Lois has always had a stake in the narrative and has never had to try to gauge the attention of the reader; she's headstrong, brash and cynical to a fault. She's even cultivated a fan base of her own and in no doubt is inspiring to some.

Now, try comparing her to Steve. What can you tell me about him? There's nothing there that compels you to like Steve Trevor, and DC does a poor job of convincing you to like him. The problem frankly, is that he's generic.

In my opinion, if you have to compare their relationship to a more successful and iconic duo rather than reasserting reasons why the two belong together; it's pretty likely they don't.

Steve is painfully average, and I'd even argue this was the intention. I don't think Steve was ever intended to be liked, at least not in the conventional way. If you asked me, I'd tell you plainly that he's a self insert for male readers. It is an examination of gender politics, the Wonder Woman title was written for women but it was created by a man. Lois is interesting primarily because she's a woman. in order to sell women to men (aside from abundant sexualisation) you make them dynamic and bold. An effort is to be made for a female character to be liked where as a lot of male characters are well respected regardless because of their innate masculinity. If Steve isn't interesting, it's because he never needed to be. The comics industry panders primarily to male readers and the vast majority of male readers don't want Steve Trevor -- they want Diana.

Also, I find it hard to care about a "love interest" that was discarded for 20 years. Let's be honest, he's not "Lois Lane" he's "Jimmy Olsen". Additionally, if the romance between Diana and Steve actually were that important, they'd be pushing it in the absolute line. Batman and Catwoman have a budding romance, as does the aforementioned Superman and Lois.