How bad is the f-word really?
I fucking love this man! It's awesome, keep it up!
Is it not a bad word sometimes?
Can it be used in formal article?
I don't know whether you're trolling with this question or not, but I'm going to give you a straight answer anyway.
While I agree that this is not a word you want to use if you're trying to make a good impression on your mother-in-law, and should be avoided in many, many contexts, there are times when no other word will do. It is possibly the strongest and most useful intensifier in the English language for some situations.
In the right context, it can be very expressive. Crude and vulgar, yes — but sometimes that is exactly what's called for.
Try to imagine Pulp Fiction or The Big Lebowski or The Sopranos without that word. No, wait — just turn on AMC when those shows are on and see how censorship of that word (frigging or some other weak-assed substitute is crudely dubbed in in its place) absolutely destroys the impact of either film.
Consider this line from The Big Lebowski, the emotional climax in which The Dude blows up at his idiot/savant (OK, mainly idiot) buddy Walter Sobjchak:
Or these lines from Pulp Fiction [Vincent and Jules are cleaning the inside of the car which is covered in blood]:
Hell, even Jon Stewart uses the word knowing it will get bleeped. Sometimes, in adult conversations about adult topics, for a particular kind of emphasis it is the exact word you need and no substitute even comes close.
My dictionary (Collins) has it as taboo, and it is best avoided in any context. Otherwise, you will initially achieve the desired effect (which is to draw attention) but ultimately everyone will join in and the office/school/house will start to sound like a barrack-room.
The only formal article in which it should appear is one discussing swearing.
The NOAD reports that:
In the sentence you wrote, I will understand the word to be used to give emphasis.
The word is vulgar, and it is not used in a formal context.