I believe that this is very much at the heart of the issue, and I hope that you’ll reconsider your stance.

Essentially, while you may have crossed the barrier that kept you from entering a heroic instance, that doesn’t necessarily mean that your character is quite ready for those encounters until you’ve accrued more gear. It might be easier to view the minimum item level as a way of preventing those who have little hope of success from queuing, rather than carte blanche for assured victory once you hit the threshold.

If you’re willing, you might find it beneficial to spend a little bit more time in regular dungeons, as well as acquiring reputation items or crafted gear, before you pass final judgment on whether healing is the right path for you in Cataclysm. After you’re wearing gear that’s a bit more appropriate to the challenge that the content presents, you might even find it fun. (Source)

This just proves what most of us have been saying all along; Either Heroics need to be easier or that cap needs to be pushed way up.
Like I said, the cap exists to prevent those with little hope of success from entering heroic instances – not to prevent anyone who might not be ready from facing them. Players with appropriate gear who meet the minimum requirements do have the capability to succeed, though that success might not come easily. For those who are having a frustrating experience, I don’t think it’s untoward to counsel gear. Gearing up a bit more before tackling heroics is probably a good bet, as it stands to help make their time in those instances more enjoyable. (Source)

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