Is "To be or not to be" really about Hamlet considering suicide or is he trying to make someone think he's considering it?

It depends on the directors interpretation. Some believe he really went mad, and therefore wants to kill himself. But then again he also states "to my madness a method be" which implies he hasn't lost it, and therefore isn't wanting to commit suicide.

The phrase "to be, or not to be" originates from a famous Shakespearean soliloquy by the main protagonist Prince Hamlet from The Tragedy of Hamlet, Prince of Denmark in the first scene of Act Three. In it, Hamlet contemplates the pros and cons of continuing life ("To be") or preferring death ("not to be"). Some commentators have read it as a debate on suicide. Other commentators have argued that it is a description of how one's ideas and visions seldom seem to come to fruition, due to one's own indecisiveness. This speech is perhaps not only the most famous soliloquy in the whole of Shakespeare's works, but perhaps also in world literature.
http://www.answers.com/topic/to-be-or-not-to-be

It is a soliloquy, which means that the character is letting the audience know his thoughts at that moment in the play. He is talking to himself, and we are hearing his internal dialogue. And, yes, he is considering suicide upon learning that his uncle has killed his father and has taken his mother as his consort.

Actual Text from "Hamlet" Act 3, Scene 1

To be, or not to be: that is the question:
Whether 'tis nobler in the mind to suffer
The slings and arrows of outrageous fortune,
Or to take arms against a sea of troubles,
And by opposing end them? To die: to sleep;
No more; and by a sleep to say we end
The heart-ache and the thousand natural shocks
That flesh is heir to, 'tis a consummation
Devoutly to be wish'd. To die, to sleep;
To sleep: perchance to dream: ay, there's the rub;
For in that sleep of death what dreams may come
When we have shuffled off this mortal coil,
Must give us pause: there's the respect
That makes calamity of so long life;
For who would bear the whips and scorns of time,
The oppressor's wrong, the proud man's contumely,
The pangs of despised love, the law's delay,
The insolence of office and the spurns
That patient merit of the unworthy takes,
When he himself might his quietus make
With a bare bodkin? who would fardels bear,
To grunt and sweat under a weary life,
But that the dread of something after death,
The undiscover'd country from whose bourn
No traveller returns, puzzles the will
And makes us rather bear those ills we have
Than fly to others that we know not of?
Thus conscience does make cowards of us all;
And thus the native hue of resolution
Is sicklied o'er with the pale cast of thought,
And enterprises of great pith and moment
With this regard their currents turn awry,
And lose the name of action.--Soft you now!
The fair Ophelia! Nymph, in thy orisons
Be all my sins remember'd.

He continues until Ophelia enters the room, and then the narrative of the play continues.

Hamlet knows that His uncle has disgraced the crown, and later instead of killing himself takes on his uncle through a play that he writes and has performed for his uncle to clue the king in that Hamlet knows that the King conspired against his own brother to kill him and take his wife.