User blog comment:Aleksandr the Great/Bioware HAS Written Themselves into a Corner/@comment-1503545-20121112224821/@comment-2250460-20121113153518

More compelling antagonists? The Covenant and the Flood didn't even have a leader until Halo 2 from a game perspective. In Halo: CE they had to use freaking Guilty Spark as the main enemy.

I'd say the Reapers are much better antagonists, they are way more unique than "aliens bent of the destruction of humanity" or "space zombies"