Thebtrick is you are asking what the opinion of one to another, when not everyome knows. I haven't played Halo or read halo books so i don't know.
However i have read near enough EVERYTHING space marine based, am experienced in the quantified accounts of Space Marines equipment (i.e how effective Boltguns are in comparison to todays weapons). I struggle to think of anything that is anywhere near capable of beating them, outside of massively outweighed numbers, or supernatural strength- daemons, nids, etc.
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