A few years ago I read Michelle Paver's "Dark Matter" and loved it, but recently I read "A Place in the Hills", an earlier novel, which I really disliked. Now if I'd read "Hills" first, I probably wouldn't have touched DM with a barge-pole, and would have missed out on a great book.
I also wouldn't read any more of Carol Goodman's fantasy novels, such as the Fairwick Trilogy, as I thought the first one was OK, and the second one was absolute tosh, likewise her Black Swan Rising trilogy, written under the name Lee Carroll - again the first one wasn't bad, but I don't think I even finished the second one, and left the 3rd one unread. I do like her "non-fantasy" novels though.
Same thing with Deborah Harkness - loved "A Discovery of Witches", just about finished the second one after being utterly bored (kept hoping it would improve) and didn't bother with the 3rd.
I also once read a Josephine Cox novel, a group of us on another forum were sent a copy to review, and nearly all of us loathed it. She's hugely popular here so maybe it wasn't one of her better efforts, but I haven't tried any of her others.
And don't get me started on Gone Girl!