Can't agree about that. I read it first as an impressionable 14yo when our English teacher made it the set text one term. I've re-read it several times since, in the succeeding decades. The last time, a few years ago now, I found the first part, covering Jane's childhood, by far the best part.
Everyone criticising Mr Rochester for keeping his mad wife in the attic needs to remember that the alternative was paying for her to be kept in a private asylum, as shown in The Woman in White. There were no effective treatments for mental health problems back then, especially schizophrenia, and madness wasn't grounds for divorce. We can hypothesise all we like about why Bertha Rochester, nee Mason, was considered mad, and I for one find it very difficult to get Wide Sargasso Sea out of my mind here, but we have no idea what Charlotte Bronte had in mind as the diagnosis (if any). There was huge stigma around mental illness and it can't have been uncommon for families to attempt to hush it up.
(Obviously trying to make a bigamous marriage was a bad idea, but that's a separate thing from nursing the first wife at home.)
A real life parallel from the 19th century: William Makepeace Thackeray, author of Vanity Fair, and his wife Isabella had three daughters in three years. The middle child died at 8 months old. His wife became suicidal shortly after the birth of the third baby. She was given all sorts of treatments but never recovered, although she outlived him by 30 years. We can speculate that she had post-natal depression, or puerperal psychosis, or a very natural depressive reaction to her baby's death, but whatever it was, it was incurable back then, and professional advice was that she would never return to a normal mental state where it would be safe for her to live with her family. 
Thackeray paid for the best care for her he could afford for the rest of his life and was unable to divorce and re-marry. He appears to have been a very decent man, a devoted father and philosophical about the turn his life had taken. He had been something of a dilettante when younger, but once faced with the responsibility of paying for his wife's care and the cost of running a household for himself and his two little girls, he worked like a demon and became very successful.