The flood is unpleasant in CE. Especially the rocket ones. I can cope with that though. What I hate are the Halo 2 flood. They're terrifying like some kind of thriller. Almost every flood fight is dark, the carrier forms always sneaking around, how ineffective snipers are, how it takes 9 melees just to phase them, the sentinels that come with it, etc. I wish in Halo 3 they were more challenging, but i am grateful its not some kind of horror.