What went wrong? The inconsistent writing, the introduction of new characters without any true backgrounds or fleshing the existing ones.. we could go on and on about what went wrong. Such a promising show meeting such a stupid fate. 

Inconsistent writing.
Twisted continuity.
Adding too much new characters and killing some of those who have the most potential (Adam, Elle, etc.)
Failure of having no main arc to the series though claiming to have one by how the series started with calling the first season the first volume in an epic story.
No sense of a conclusion to the series.
Weak romances with only a handful that have great potential only to be extinguished before it could go the distance.
Sylar did wear a couple of black hats, but maybe a cowboy hat or some space goggles or something.
He should have been proactive, and into recycling.
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