Man, few things have made me feel like more of a philistine than reading Moby Dick earlier this year. I read a lot, but I've never considered myself a "literature guy" and wow Moby Dick cemented that. I did finish it, but I thought it was just an awful read, absolutely boring from start to finish. About halfway through I was just skipping pages and pages and pages of filler descriptions and incomprehensible 20-page-long speeches. I absolutely hated it, among the worst books I've ever powered through to the end.
It's definitely a "me problem," obviously people who are into literature and analysis get a lot out of it. But in future I'm gonna stick to my dumb sci-fi books where people talk in comprehensible sentences and things blow up, lol.
I definitely get it not being everyone's thing. But I really really love Moby Dick. It is so funny! My wife kind of prepped me for viewing a lot of it as comedy or humor, especially toward the beginning, and viewing it through that lens absolutely helped. The language is old enough that you sometimes have to realize that the author is being funny, but it is there. I really loved all of the information about whales... that is just not true. Wasn't even thought to be true at the time.
I would definitely stay away from Alexandre Dumas then.
I pretend to have a modicum of taste and while I didn't find it boring on the whole, there's a much smaller yet better novel that could be extracted from it. It's just way too self-indulgent and meandering at times.
The promotion of "classic" literature is largely about exposing you to depictions of the lived experiences of others through history. You can probably find better sources for that these days. It doesn't have to be unbearable without going into it with a specific goal (like wading into muck to save a puppy), but it often is.
People like what they like, so if that's not your jam I wouldn't sweat it. That said, Moby Dick is perhaps a poor example of "literature" to start on if you're not sure you like "literature", mostly from being so long. If I might recommend trying Cosmicomics by Italo Calvino, or The Cyberiad by Stanislaw Lem, as they are easy to dip in and out of are nominally "sci fi" while still laying some claim to "literature". Lem and Calvino may lead you to Borges or PKD or Ursula K LeGuin or China Mieville - more genre artists that arguably aspire to being more than pulp.