the character developments were incredible, but it also had loads of action to keep the show interesting (e.g. the tornado episode). i cant believe they cancelled it after four weeks: it hardly seems like they gave it a chance to show how good it actually is.
luckily in the UK all episodes have been aired, and so I have seen them all. The last episode ends with the series begging for more, its unfair to fans to leave them needing an answer when they so desperately want to know what happens to all the characters!
In conclusion, it was an amazing show, but it doesnt look like we have much of a chance of reviving it with that petition.