Well you're not all wrong there, and you know it.
The word itself,
opera, comes unaltered from Latin and simply means "work".
Some might find an opera a piece of work to listen to, at first, but the overall body of work the genre offers today must encompass every human emotion and dramatic situation any of us have or ever will encounter. It's amazing how many ways there are to tell familiar stories in ways that seem and sound entirely new.
So yeah, they're like musicals, and could be in any language (some are occasionally sung in translation to another language), but in operas just as in musicals, the bottom line speaks to shared emotions and familiar human experiences.
For those who have never bothered to listen to any operas, dip a toe in and you'll not regret deciding to explore further by listening to both world acclaimed and little known operas: they're all capsules of culture and music at a given time. Some are comic or playful, some tragic, some perfectly capable of striking a sympathetic chord in listeners (or else just comic relief) even by depicting less dramatic emotions like boredom or impatience. In my experience, once you get hooked on opera... it's a lifetime interest. Nice to know now the addiction can be indulged on demand via my AM subscription.