Chris Colombus' Harry Potter films. These two are easily the weakest of the series. I think WB could have found a much more capable director.
Absolutely! Also, if they actually came to their senses much earlier, Goblet of Fire should have been split into two films - and I suppose The Order of the Phoenix as well.
As far as other remakes/reboots go, for me so far...
- The (Wonderful) Wizard of Oz (a more faithful adaptation with the darker elements and out with the musicals)
- The Last Airbender (take the rights away from Shyamalan and give the IP to a filmmaker who would do the series justice. Nostalgia Critic really tore that movie to shreds lol).
- Planet of the Apes (only bringing this up to match the quality of the current films pretty much, however, there's still more story to be told methinks)
And while Peter Jackson's LOTR was a resounding success, I
would actually love to see an adaptation of the book translated to the small screen next time, just so we can get to learn of the many details that never made the films, such as Glorfindel carrying Frodo to Rivendell, Tom Bombadil, Ghan Buri Ghan the Wildman, Halbarad, Prince Imrahil, the Scouring of the Shire and much much more.