I play a manufactured void deck almost every saturday, and I dont always win (go figure? ha)
will it win a chunin? It could! But it probably wont. However, its the chance that any deck type could win that makes this game fun.
Also, I play puppets quite a lot. I don't find it to be particularly good against my deck but others have had more trouble.
You guys also forgot JI. When JI hits, its disgusting.