We have seen plenty of live-action adaptations over the years, and there are more to be released. Everyone can agree that while some adaptations are more than decent enough, others are just so bad that fans are trying to forget about them ever happening. Unfortunately, there are a lot of ways an adaptation could go wrong.
Story Revisions
We already know this factor all too well, especially since a lot of good narratives have been ruined by it. There are times when minor changes are understandable, but drastic shifts tend to alienate the existing fanbase of the franchise.
Another circumstance that falls under the category is the culture change. Some of the humor that would've made people laugh before could be seen as offensive now, and so showrunners will have to gamble on whether or not they will make revisions.
Sadly, a lot of producers bet on the wrong choice. In one scenario, by trying to adapt the story to the current ethical beliefs, some elements from the stories that play a huge part in the big picture are taken out, angering fans along the process.
On the other hand, if certain toxic elements are kept in the story, there's also the risk of facing a mob of advocates on the topic stating that certain aspects are meant to be left in the past. At this point, there will always be a difference in opinion, and it's only a matter of pleasing the majority.
Changes in Characters
Since adaptations are simply remakes of existing and beloved IPs, fans of the franchise already have an established image of what the characters look like. With changes made in their appearance, it becomes easy to dissociate from something or someone they have grown to love.
Arguably one of the biggest issues right now is the changes in race for particular roles. Sometimes, companies are pressured to make the show as diverse as they can (whether it's genuine or to bait viewers) that the changes don't even make sense anymore.
There are instances when the changes are good, especially if the alternative doesn't affect the story at all, or if the actor portrays the role so well that not looking like the source material is a factor that's worth overlooking.
While some associate the complaints with racism, there are others who counter the argument, saying that instead of replacing the originally Caucasian characters, good stories that revolve around people of color should be created instead.
Creators Not Appreciating the Source Material
Viewers can tell when the creators behind a live-action movie or show loved the source material. They tend to stick to the original and do right by the stories and characters. It's also quite obvious when changes are made to make the most profit.
The same can be said for actors. Of course, they are professionals and can do their jobs well by just knowing about the scripts they are given. Still, the love for the source material tends to reflect on their performance since they love being a part of the franchise and don't want to disappoint fellow fans.
Lack of Budget
Between sets and CGI, creating a show or movie will take millions to billions of dollars. However, some have to work with the provided budgets, and depending on the subject, that might not be enough.
Sets require so many things to set up and sometimes filming is done in various locations, which will cost a lot. Visual effects, especially for fictional content, tend to take a lot of labor and time. With low budgets, movies and shows could end up with terrible green screen scenes and bad CGI.
