I went into this without knowing anything about the plot and would recommend you to do the same if you are still unspoilered, because some of the turns of the plot really surprised me.

What I greatly enjoyed about the book is its superb writing. Charlotte Bronte's command of the English language is nothing short of astounding, and her description of the various setting and a treat to read. 
 
However, my main problem with Jane Eyre is the romanticisation of abusive, manipulative and toxic character traits and relationships. I could not help but cringe at many of the supposedly sweet or romantic interactions throughout the book.

Furthermore, there are some deeply misogynistic archetypes, and the language throughout the book is at times ableist, racist and colonialist. 

In its own time and society, Jane Eyre was in many ways a revolutionary piece of writing and I definitely recommend it to be consumed as a historic product of its time. But if you are looking for a sweet and unproblematic love story, you should be looking somewhere else.