@RevolverOcelot:
You know you suck as a writer when fanfiction of your work is better than the original work .
Not at all true. Fanfic writers have the benefit of not being constrained by time, medium, or target audience age. Its much easier to write a few thousand words of text every month or two than it is to actually write and draw a serialized comic on a weekly basis that has to go through editorial approval.
They also have the benefit of hindsight where the original production went wrong, (sometimes due to shark jumping, new show runner, actor leaving, etc.) the fact that the general world and characters have already been built for them, have a general knowledge of the fandom and what it likes and has a consensus on, and can completely bend the genre to something other.
For instance, taking a Ranma story and actually writing out the dramatic emotional conclusions to all the love triangles, making the characters mature, and adding in some death and demons taking over the world, is interesting and can be gripping… but its not at all what the original was about.
Or having a Harry Potter story where Harry travels back in time, and armed with foreknowledge of all that is about to happen, takes things super easy and acts like a complete goof can be a ton of fun... (and is now my preferred version of the story) or a story where Harry is raised by a much better, loving Uncle that teaches him the value of reading and thus makes him an intelligent scientific ten year old can be very rich and interesting and go in very dramatic dark directions... but both are largely based, at least initially, entirely on knowing the original and WHY its interesting that they're different.
Most of the time fanfic works because you already have an investment in the characters and world built up from the original. (And many many many fanfics latch onto the secondary casts... because they lean towards a particular personal favorite, and feel those are the ones with the most potential development and space to grow.)
There's a ton of great fanfic out there. But not a whole lot of those writers go on to create original works.