I felt the same way when I saw The Usual Suspects. I found those guys to be rather unusual!
Never defend crap with 'It's just a movie'
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I just watched this again for the fourth or fifth time (since I watched it on video years ago). It's a sweet and tender movie to me - now that my kids are grown. The couple is so young. Even though I had kids relatively late in life, my husband and I were such kids compared to today, now that our kids are grown and out of the house, leading independent lives. Facing a lot of the growing pains that this young couple faced, and that we faced.
For a really pretty accurate depiction of pregnancy and birth - with drama - see the story arc in the tv series '30 something' in which one of the characters and his girlfriend have a baby. Peter Horton's character. It is such a good story and the birth is emotional and everything that the characters hope for - and fear. In other words, a realistic birth.
This movie still captures a lot of those fears and hopes and nerves and drama, without having devoted the majority of screen time to showing it over and over again.

The title of the movie wasn't "She's Getting Pregnant and Giving Birth".
My wife and I don't have kids (yet) but we want them. And over our years together we've had a lot of discussion, and there's been, at times, some apprehension, some worry about being ready, etc. Maybe we're unique, but I think the point the movie was trying to make was that having a baby isn't just about the physical act of carrying and having a baby. It's about the emotions that go with it. Feeling nervous, insecure, etc.

Oh PLEASE. When the title of the movie is "She's Having a Baby" someone should seriously have to read the synopsis? That is in no way an ambiguous title at all and should not require research.
I will say that I distinctly remember the ads for this movie from when I was a kid and they depicted the movie as being about this guy's wife having a baby. The movie is not truly about that with the exception of a very short portion of the film.
Not saying the movie is bad or anything (I personally find it very weird and somewhat uneven and also hilarious in some parts) but the OP is correct in saying that the ads and yes, the title, are misleading.
"It's Minnie Pearl's murder weapon."

She said she saw the preview multiple times, and still felt mislead. A preview should at least give you the gist of a film's plot or theme.

Honestly, its not that serious to me. I've watched many movies without researching its plots. If they're no good, I cut them off. I didn't purchase the DVD. I watched it on Netflix.
I looked for recommendations and took them. Wasn't what I thought. Oh well. I've moved on.
Sometimes movies are disappointing. Such is life!

But it still doesn't answer the question as to why you would watch any film without reading what it's about unless you're just a die hard fan of the writer/director and will see anything by them. The title might be misleading, but the descriptions always explain that it's about Jake and his struggles with marriage.

I was expecting a snarky remark. Seems like everyone on this board is very sensitive about it.
I chose this movie cause its popped up on several "great movies about pregnancy" lists. It just so happened to not live up to that at all.
Oh well.

Well, duh. How about reading what the movie's about instead of just looking at the title? Would you do the same to a book?

I have to agree with the OP. I decided to watch this since I am also expecting but was surprised to find it has absolutely nothing to do with pregnancy and having a baby. The pregnancy was 5 mins and they didn't even get pregnant til very late in the movie. The title makes it seem as if the whole movie would be about having a baby but its really not.
Seems its more about the Jefferson character adjusting to married life.

God forbid they wanted to give some back story and develop the characters before dealing with the pregnancy right away.
I think you're kind of lame and misled.
Cheers!

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What's misleading - she did have a baby in a dramatic sequence, no less. The birth process was a culmination of his process of growing up and learning to appreciate what he had.
I saw this many years after our first child and found it very nostalgic and really identified with the couple, having gone through a lot of what they went through. I was also an L&D nurse. I found the scenes surrounding the birth some of the most tender and evocative ever in a movie.
Maybe in a few more years, you'll see it differently.