I dunno Platon. I guess it's interesting how different players respond to differing scenarios in gaming.
The introduction of the flood in HaloCE (and by extension their appearance in every other Halo game since) have been the lowest parts of the entire franchise for me. I get the point about enemy variety, but to me there was simply nothing fun about trying to frantically shoot at a gazillion dumb enemies that just rush at you an explode. I also hated the lambent imp-like locusts and clickers in gears for the same reasons.
I hate the flood in Halo more than any other variation of the "homing missle enemy" design, because in Halo the contrast between fighting the flood and the tactical thought-requiring combat against the other enemies in the game is too stark.
In HaloCE i went through most of the game thoroughly enjoying the gunplay exchanges between myself and seemingly "smart" enemies (a hallmark of the series - ostensibly excepting the Flood). Then I encountered the flood and all my tactics and strategies for battle i'd learned, developed and honed during the course of the game instantly devolved into "twitch-gamer-bunny-hopping-and-firing-as-many-rockets-and-grenades-around-the-room-as-I-can". It was awful and ruined the experience for me. The latter level in Halo 3 where you are simply gang-banged by the flood for what feels like an eternity of a level, is the single worst gaming experience i have ever had the displeasure of taking part in. Since then i lost all confidence in Bungie as a dev, as i simply could not see how anyone could conceivably consider the flood as a fun or enjoyable enemy to fight in a shooter game, regardless of how well they work for the series narrative. It's the worst, laziest enemy design every conceived.
Halo 4 NEEDS to leave out the flood. Even if it means retconning all the expanded universe material to eliminate their presence from the game. No dev should ever feel compelled to degrade the quality of their game, by including another developer's gross mistake, simply of the sake of continuity with the EU narrative and story.