Tenacious D is the greatest band ever.

According to its movie poster, since conquering the music world, the duo of Jack Black and Kyle Gass has made the greatest motion picture of all time in Tenacious D: The Pick of Destiny.

The aforementioned poster's mock of Michelangelo's "The Creation of Adam" with a nude and rotund Black and Gass affirms that with any claim they make, their tongues are planted firmly in their cheeks.

Despite what the over-the-top theatrics of the big screen might tell you, the real life history of Tenacious D is that of two friends from an acting troupe who created an offshoot comedy sketch.

They performed music and comedy live and completely in character in small Los Angeles clubs, creating a buzz among both the music and movie industries.

Just before Black's acting career took off into the stratosphere, he and Gass were offered a show on HBO. It told of their unfounded claims at rock prowess while struggling to pay rent, since their only source of income was open-mic nights at the bar.

I've been laughing to these guys for almost seven years, so it pains me to say that despite their success otherwise, the movie just doesn't hold a candle to the aforementioned mediums.

There are some scenes that bring the house down, namely the opening rock-opera with a young Black at odds with his uber-religious father (played by Meat Loaf).

After being inspired by Dio in a vision, he runs away to Hollywood to form "the world's most awesome band."

Another showstopper is Black narrating his every move in song while breaking into the Rock and Roll History Museum to steal the Pick of Destiny.

The pick is said to have mystical powers that make whoever possesses it into a successful musician.

Much of the promotion for the movie seems to try and cater to a more general audience, and this is a huge mistake. Despite the R rating, it seems The D is pandering to 15-year-old kids with its sarcasm, drug use and childlike naiveté.

The power of The D doesn't work in the box office, with or without the Pick of Destiny, which is evidenced by only making $5.2 million over the past two weeks.

While there are definitely some outright hilarious moments, The D seems to have left some of the best aspects of its comedy to be watered down.

What's really at hand is that The D should have made a good amount of the movie a tribute of sorts to fans of the show and its self-titled album.

A throwback to old favorites while adding on a new chapter to the Tenacious D saga would have been perfect.

Instead, the tight duo of Jables and Rage Kage of old now comes off as world-renowned superstar Jack Black and his less famous buddy, actor/musician Kyle Gass.

GRADE: C-