Not to keep derailing the thread, but it's also very true that Lois has not always been written well, and for whatever reason some of the old stereotypes about her persist. I personally harbor nothing against Lois, it's just that some incarnations of her have been better than others.
So, one of the reasons I've seen cited for not liking the Superman/Wonder Woman pairing is that they "dehumanize" each other. I don't really agree with that myself, that suggests that by themselves they already lack humanity to begin with.