I do have a problem with the Olivia-drugged-as-Fauxlivia plot. I don't really buy the reasoning behind their doing it or the technobabble (or lack thereof; they really didn't go into it as they have some of the other Fringe science on this show), it seems a little much to dump on Olivia, and I kind of miss Olivia. Thankfully, it seems to be over now.
Other than that, my love for Fringe has only increased with time. I enjoy its plots. I love the alternate universe and its characters are just as interesting to me as this universe's.