You need to stop capitalizing the prepositions in your title.

But even the most ingenious criminals make mistakes with all their elaborate planning. I perhaps just bought the mistakes better.

Exactly. Logical believability and realism are two different things.
Breaking such rules is called a "movie sin."
http://cinemasins.com/

It's not about a movie being REALISTIC, but logical, to have consistency in its logic, you must respect the rules you established earlier in your story, and not change them whenever it's convenient for the plot.

Just the ending. That's it.

you think it's unrealistic that the main character is human who made two mistakes in his life!!
i mostly will not be able to answer your reply, since marissa mayer hacked my email, no notification

You folks make valid points about people nitpicking at a movie. However, this film is an obvious exception to that rule.
Clyde led a career working for the Department of Defense finding genius ways of remotely killing people. Even the spy Nick meets warns him that Clyde is unstoppable. Clyde is so intelligent and so experienced in his line of work that he would not make critical mistakes, especially after spending ten years planning things out.
The writers set things up the way they did to advance the story toward a desired conclusion but it contradicts the main character. The whole movie is spent establishing how brilliant Clyde is, but then he makes a terminal mistake? Highly unlikely.
Think about the randomness and chaos of life. While Clyde executed his plan with Darby, a hundred things could have gone wrong. But he planned very carefully and pulled it off. After spending ten years planning and preparing the tunnels, would Clyde really have left them unguarded? I highly doubt it.

I'm with you. I liked it. Yeah I had a couple of questions after seeing it, but for the most part I enjoyed it.

Could not agree more. Everyones a critic these days. Even though most people have no business in doing so.

And thank you for trying to start an argument, it won't work.

Thanks for allowing us to have our own opinions.
When they agree with your own.

For some reason, more-logical movies tend to be adapted from books.
If all the people complaining can then why aren't they in Hollywood doin it?
Hmm, maybe because Hollywood was never an equal-opportunity meritocracy.

Right, and besides who of us can do any better? If all the people complaining can then why aren't they in Hollywood doin it?

You are exactly right about everything you said. It seems these days a lot of people just look for everything they can find wrong with movies instead of just relaxing and trying to enjoy them. A lot of people want to examine what they watch and find some plot hole that no one else thought of. Movies and TV shows would be so boring if they just followed everyday life.