Everyone loves the premise, and most people have heard it: take various characters from various different victorian literary sources, and assemble them into a single superhero-style team. If you saw the film and were disappointed by how poorly they lived up to that premise, i can only beg you to give the comic a chance, because it bears very little relation to the silver-screen incarnation (why buy the rights to a book and then change every detail in the adaptation? i don't know, you'd have to ask the film-makers...).
This is a great book. It's brilliant fun, but it's also sometimes creepy (there are at least two team members who'd sooner gut the other characters than work with them) and occasionally thrilling. If you know anyhting about victorian literature you'll love playing spot-the-reference; i don't, but i've spent hours following up clues and leads on the internet, and i can assure you that even experts on the source material can find new, sneaky references after their fourth, fifth and dozenth read!
You don't have to follow them up though, it functions as a straight-up adventure story too. Like i say, I'd read Dracula, 20,000 Leagues Under The Sea, King Solomon's Mines and The Strange Case of Dr. Jekyl and Mr Hyde before i picked up League, and had naively thought myself reasonably knowledgable about the source material, but i've since had my pride bruised and my mouth well and truly shut. Luckily, you can go into the story as ignorant as you like and just enjoy it as a ripping good yarn.
It's got many, many levels, this one, and it functions perfectly on all of them. Great stuff!