A website that's successful has these characteristics:
It's Original or distinctive Content:
There are thousands, if not millions, of websites on the web rehashing a similar previous content or selling a similar old thing. This is most likely even additional so nowadays with blogs being very easy to make. Those sites more or less talk about a similar old stuff all over, or sell a similar old thing within the standard way. A prestigious and successful web site is one that makes original and new content, or provides some outstanding service, or sells something distinctive, and therefore stands out from the crowd.
It has useful Content:
Original and distinctive content in and of itself is pointless if it's of no use to anyone. Note that "use" doesn't essentially mean that others ought to be able to take direct action supported your content. Even blogs that tell of (say) your struggle with some explicit issue in your life (be it office politics or relationship problems) can be considered useful to others as a result of it helps them perceive or cope with their own problems. Therefore, when I say "useful" I mean it in the broadest probable sense.