This is all your opinion. And a few other people's opinions. You aren't wrong. It's just a matter of taste.
Part right, part wrong. There's definite good writing and definite bad writing, and Gravemind is one example of the latter.
Without the gravemind the flood can't think.
What you're saying is that it was necessary for Bungie to create Gravemind because Bungie told us that the flood needs Gravemind. That does not explain
why Bungie decided to dream up a Gravemind in the first place.
When you dream up original characters and write them into a story, your original conceptions are just that - original, with no real "reason" for their existence. They just exist. Logic and explanations follow from there. Not the other way around.
That said, Bungie could have done anything they wanted with the Flood. They could have explained their purpose and their methods any way they wanted or they could have left them completely unexplained.
But the general idea of graveminds is not a bad one for the series, to me it makes complete sense, we just happen to see a poorly designed one.
Right. And this is inexcusable. It's an example of bad writing, a bad story element. It's one piece of the greater puzzle that is, "Why does Halo 2's story svck?"
Thank you, ladies and gentlemen. You may sit down now. Questions?
Without the Gravemind what are the flood?
I don't know. And one could say it doesn't matter. For all intents and purposes the Flood were a http://en.wikipedia.org/wiki/MacGuffin up until Halo 2 came along, at which point Bungie made it their goal to give the Flood a face and a purpose. At this they failed, and we have Gravemind. 'Nuff said.
But one example does not make the story completely bad.
That's right. And as I said before, I would give more examples if I cared... which I don't. But perhaps one day when I am in the mood we can continue our exploration of this most fascinating and debatable subject together.