Why do people want a faithful manga to anime adaption?

[Sonydjsnmix]

We all heard it before. The manga was better blah blah blah... But why do people want the anime and manga to have the storyline told a exact same way? Wouldn't that be boring? I love that fact that the anime tends to tell the story in a different way.

[Enigma]

Some people just love the series in a passionate way, Hence wanting a faithful adaption

[Kariudo]

The original is (almost) always better, and people always complain

[Taite]

I personally dislike it, because how can you call x-anime y-manga's anime if it's not the actual story? I like seeing the story being told how it was written, but in motion.
I'm not too sure what you mean by being told in a different way --99.8% of the time when animators change anything in the plot, it ruins it. Though there are different levels of change from anime to manga. Some have slightly different dialogue, which is a-okay; there can also be times when certain events are altered, ie, happening at different times-- which can be stepping on a mine, ruining it, or just sliding past, noticeable, but not having a major impact. There are also the cases when anime completely jumps ahead of a manga, such as Kobato, and is a different story on its own, it seems.
When manga are made into anime, they aren't told the exact same way at all. The fact that one is being read and the other you watch is a HUGE difference in my eyes. I like it when the story is told in those two different ways -- manga and anime. Not story and story.

Just my opinion.

[EkaCoralian]

Its not so much that fans will get too angry if a small thing is changed; it really all depends on the anime's ending, most of the time. Fans usually get mad if its a completely different ending, or if the ending isn't even halfway through the manga series (or something like that.)

Now, I'm pretty much like that, but I've come to like mangas which are different than the anime (or vice versa) if I know beforehand that they will be different.
For example, when I started reading the Eureka seveN manga (since it was based on the anime), I went in thinking that it'd be really cool reading and seeing drawings of the characters from the show in contrast to watching it on the screen. By Volume 3, the manga took a severe turn in its plot and decided to basically make its own plot up. The first time I read through and finished the manga series, I was disappointed: big time. But after reading it a few more times, I just realized that I didn't like it because everything was changed from the original that I knew and loved. After re-reading volumes every so often, I came to terms with the manga and bought it. After all, it was just another adaptation. Now, as much as I would love a faithful manga adaptation, seeing E7 in alternate ways has truly pleasantly surprised me over the years (eg.: Eureka seveN movie? I loved it. Eureka seveN Light Novels? I've read Volume 1 and am loving it.) But if the manga was a faithful adaptation, and only had a few minor changes in it by the middle of the plot, I wouldn't mind. As long as the ending is the same.

So... it really boils down to the ending or the plot as a whole. Its just because most fans are so used to the originals, and they don't want to see difference in an adaptation, because (the way I see it) its almost like copyright if you take someone's work, and change it up completely. Now, that opinion of mine has obviously changed, but way back when, that's how I looked at it.

[Sonydjsnmix]

Taite. Told in a different way wasn't the best wording on my part. It is impossible to tell the story in the same way with manga and anime. I meant changing some things about the plot.

If I fell in love with a manga for it's story and/or characters, I would like to see those aspects in an different way to keep things fresh. Kinda like fanfiction.

[Sukunai]

As with books, often the reason the manga or book in other cases was successful was precisely how it was done.

And like as with movies, often when the director, in his oh so knowing fashion (according to him at least) decides it should be differently accomplished, they are not always right, or even close.

Unless the manga writer says it is ok, it isn't. I tend to prefer a manga get retold precisely as I usually watch anime based on the manga that made it popular.

Yes I don't read manga much, but, I do recognize that it takes a popular manga to give rise to an anime in most cases.
And you can usually tell when an anime will fail, when it refuses to have an identifiable story.
And manga has nothing if it doesn't have a decently written story.

[CodeZTM]

Because 90% of the time, one or the other is going to suck. And suck big time.

[Qyot27]

Unless the continuities were completely separate and distinct to start with (Galaxy Angel, for example - the anime is very episodic and not plot driven at all, whereas the original visual novels and manga follow the actual series' plot; the anime is the way it is because Broccoli didn't want to give away anything about the plot of the games, and therefore used the anime as something totally different - because the manga adaptation came afterward, it was ok for it to use the plot, although I don't think the date sim aspect of the games went into the manga), then there's going to be complaints. Basically because script writers are often horrible at making up their own plotlines if the series is based on a pre-existing work. Look at any filler arc in Bleach or Naruto, which are sort of the most recent poster-children for awful filler.

If the series has a distinct and well-established AU avenue to go down, the blow gets softened. Look at all the different official spin-off adaptations of Evangelion. The original anime and the Sadamoto manga (which still hasn't finished), both Iron Maiden/Girlfriend of Steel visual movels, Iron Maiden 2's manga ('Angelic Days'), the Raising Project games, the Shinji Ikari Raising Project manga, or the Gakuen Datenroku manga spin-off (which is extremely different from the source canon and slice-of-life episode 26 rehashes). And then of course Rebuild.