My wife has read most of his stuff. I know because I buy it for her. She says aside from Dracula, most of it is not great.
It's one of those firsts that established a genre.
I know Stoker didn't invent vampires, but they came into western English speaking culture through his Dracula.
By the way, for anyone who is thinking of reading Dracula's Guest, it is likely it was intended as a first chapter of Dracula, but was cut.
I realise I've used vague terms in that sentence, even setting aside the tricky question of what makes the things often described as great works "greater" than things that are looked down on, but might be much more popular.
I once read a great foreword to a novel lamenting the loss of "good bad books", citing Dracula as an example. It was by a famous author (as I remember), but I can't remember, and can't find, the foreword or the novel I'm thinking of.
There's also a sub-theme of the too secular modern men who don't believe in superstition (Jonathan Harker doesn't believe in vampires in the beginning) needing to get in better touch with Christianity to defeat Dracula- and features a rejection of secular psychiatry to defeat what turns out to not be "mental illness" way before The Exorcist did it.
Sadly I had really bought into the vampire chic trend when Coppola's Dracula came out in the early 90s. I had my dentist create some fangs for me to wear. More than one woman formally requested me to bite them on the neck. I dressed for goth clubs, more or less like an Anne Rice vampire (another thoroughly gay mythos).
It wasn't until Stephenie Meyer claimed vampires for the Latter-Day Saints movement that those Twilight sparkling dudes could be considered thoroughly hetero.
Thematically it is of course a dogs breakfast of repressed sexuality, homosexuality, etc. All of which were taboo topics in the Victorian age. Which is precisely why the story works so well. And even today it still works. If you can get over the Victorian era biases, it's a surprisingly fresh and modern story. Which is why modern takes on the story are still interesting.
And of course, these topics are still playing a role. Just look at the current election round in the US where things like abortion and gay rights are still being challenged. And it's not just the US where these topics are used by populist politicians to gain votes.