I wouldn't call it romance...it was definitely light romantic comedy and doesn't hold up well over time. I prefer supes on the big screen with a large budget or in animation as opposed to the small screen. I agree that the romance is a big part of it, but I like it mixed with other stuff. The fact that superman can offer something to almost every viewer is what makes it less than ideal to limit him to romantic comedy.
It was a compelling romantic comedy due to the very good writing, acting, and chemistry. Let's not apologise for it just because Krypton didn't like it... it reached 20 million viewers a week at its zenith, and is thus the first or second most popular iteration of Superman ever made. It was one of those shows "everybody" talked about, of which most shows are not.
There are several great writing moments on that show. Here are some:
1) In one of the first few episodes, Lois says she likes authentic Chinese food, so Clark flies to China. In a follow-up episode a few seasons later, he gets her cheese from France after she said (unwittingly) that cheese tastes better in France. Her reception to the gesture is more lukewarm the second time because she's comfortable with Clark being Superman.
2) There's a "love perfume" episode in season 1, episode 5 or 6. Lois accidentally gets hit by the perfume and gravitates to Clark, not Superman. That's not expected. It sets the stage. She lusts for Superman, but she loves Clark, and in that sense the show is consistent in its writing.
3) Season 2 brings in Tempus and HG Wells in a tremendous episode. Tempus moves on to become one of the most interesting Superman villains, ever. They send Lois and Clark back in time and Lois first learns the secret before forgetting due to time travel. She rescues Superman from disappearance from the timeline and holds baby Clark. Hatcher successfully convinces that she is mesmerised by a beautiful baby.
The episode is also a fun reference to the brilliant 1960s movie "The Time Machine".
4) Season 2 finale, Lois finds out who Clark is in a romantic way that fits the show. She recognises that they both touch her face in the same way.
5) "Who's asking, Clark, or Superman?" becomes one of the most famous lines on television. It fits the character well, it fits the moment, and its witty.
6) Episode 3x02 or 3x03, Clark and Lois go campaign. Lois asks him not to use his superpowers for the weekend. He obliges. He then has trouble making a camp fire. She laughs and says "this is what I imagined a camping trip with Clark would be like".
7) Early in season 4, Lois and Clark find out they're not reproductively compatible. Lois cries. Clark says "I had sworn that I would never make you cry".
And so on and so fourth. It was great. I'll watch it again in a few years.
PS When Lois says "are we done measuring *****" at the start of MoS, she's saying a line that Goyer lifted from season 4 of Lois and Clark.