For those who blame Kevin Sullivan...
He's not the only person to blame for this monstrosity. The "heirs" of Lucy Maud Montgomery are just as despicable as he is. They forced the company into a situation where they had no choice but to create a completely original storyline that didn't use any plot points from anything LMM had written (despite the fact that it should all be in the public domain - the "heirs" have a nice little setup with the Canadian government that allows them to continue to collect royalties on something that should legally no longer belong to them).
However, it's a shame that Sullivan childishly allowed his contempt for "the heirs" to spill over into the movie, which comes across as three hours of "nya-nya nya nya-nya" directed at them at the expense of the legions of fans who waited 13 years for a new film. They wanted to see the characters they were familiar with in a story that made sense, not a treatise on all the ways Sullivan could think of to spit on LMM's memory while still managing to make a ton of money that they "heirs" couldn't touch. Mr. Sullivan needs to go away now.