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Mirai Nikki is a poorly executed show filled with contradictions, illogical character behavior, forced plot advancements, haphazard personality changes, inappropriate scene changes, moronic plot twists, lunatics and most of all: imbeciles.

The plot is quite simple. The God of Time and Space (Deus Ex Machina) is looking for a successor. Thus he invites Yukiteru (our male protagonist of this story), Yuno (our female protagonist and Yukiteru's ally/classmate/stalker/girlfriend) and ten others to a battle royal in which the last survivor becomes the new God of Time and Space. While everyone's identity is concealed from each other, Deus Ex Machina declares Yukiteru his favorite to win this death match. Subsequently the other participants decide to focus their attention on Yukiteru. Strangely they are kind enough to stand in line, waiting for their turn to make their appearance. Coincidentally the majority of the contestants are wacky, deranged individuals.

All contestants are given a "Future Diary" (in most cases integrated in their cellphones) which tells about future events as the holder would perceive it, as long as the future doesn't change due to any interfering actions of a diary holder. That means: First, the diaries can be used to change the future, which also automatically rewrites the entries of all Future Diaries. Second, the diaries don't necessarily tell the truth.
Example: A person holds a coin in his right fist, while his left is empty. Your diary tells you the coin is in his left. You respond accordingly. Without revealing the coin he assures you that your answer is correct, and your diary had predicted your perceived future correctly, even though it was a lie.
What kind of information those predictions contain is unique to each holder and seems to depend on his job and interests. Best example would be Yuno's diary: As she is quite obsessed with Yukiteru, her diary contains information about his future actions in ten-minute intervals.
Disadvantage of those diaries is, that damaging them results in the owner's death.

While the setting of Mirai Nikki had any means to create clever, sinister characters and stories, it turned out to be a badly executed, mindless slaughter show. That is primarly because of the vast number of inept characters and the implausible changes in their personality.

The average IQ of the cast seems to be crawling around the ten point mark. The plot advances often by exploiting the sheer stupidity of the cast, forcing them to behave in such unrealistic manners that it insults the intelligence of the viewers and ruins even the slightest bit of credibility of the characters as they simply don't act like humans.
Example: Your friend 'A' is sitting unconscious on a chair, located in a very suspicious-looking room which looks like an obvious trap. Your friend 'B' wants to go into the room to check on 'A', but before going inside, he tells you to stay back and hold the door open. You shout enthusiastically "Leave it to me!". Satisfied with your response he goes into the room.
So, what do you do as a brainy character of this show? Damn right: Ten seconds later you waltz into the room, the door closes behind you, locking you all inside, and you make a face which literally screams "Oh snap! I totally didn't see that coming!".
(While the manga handles this scene slightly differently, it isn't errorless either.)
The worst thing is, that such irrational behavior is being used all the time for almost every character as if there were no intelligent alternative.

Adding to the characters' idiocy comes their fluctuating personality changes.
Yukiteru is an antisocial, gullible, pathetic, insecure, unmotivated, spineless, gutless and brainless teenage boy and Yuno is a crazy, insane maniac with a psychopathic obsession with Yukiteru.
While the original personality of most of the characters can be accepted by itself, the real problem lies in their unpredictable and unreasonable personality changes - especially those of Yukiteru - making them do the most ridiculous and unbelievable things.
Turning a coward into a leader-like figure, letting him kill several dozen people with a callous countenance and then, just moments later, turning him back into his coward self, making him sob "I never wanted to kill anyone!", is just one example of many baffling personality changes.

As Mirai Nikki is a show about a tournament in which the winner becomes nothing less than the new God of Time and Space, you would expect that some events had an influence on their surrounding world or that they would carry some other sort of significance. But many events are just swept under the mat, as the characters act like they've never happened in the first place. That is not only due to a poorly written script, but also thanks to absurd and erratic scene changes. The combination of both makes it feel like the viewers are supposed to forget these events, as it seems much more important to see the characters visiting a bridal fair or grabbing boobs in a hot spring.

While the ending was already predetermined, the rest of the show felt like a messy series of introductions and killing offs of characters. Although some individuals were given a background story, none of them played a significant role or showed any ambition to win this death match. In the end they served no real purpose and were quickly forgotten.

Animation-wise there is nothing extraordinary to mention. It's pretty much mediocre. The animation shines best when showing one of Yuno's many facets of her going crazy.
The voice actors fit the cast quite well, the soundtrack is nice to listen to and serves the show as a decent musical accompaniment.

To sum it up: The combination of lacking intelligence of the cast, the fluctuating, random changes in their bahavior, the nonsensical, erratic scene changes and the stolid, rushed plot advancements makes Mirai Nikki an utter disaster.
While I never take fictional work too seriously, Mirai Nikki's overkill of stupidities made it difficult even for me to enjoy myself.
Otherwise, I can only recommend this show to people with a predilection for trashy shows as they will most likely have their fun with it.