Let's put it this way in terms of overall battles (space is pretty much the only thing that matters in this kind of scale).
UNSC would maybe be able to beat the combined mights of ME in a year at the very least.
Covenant would be able to beat the combined mights of ME in a month or two.
Ancient Humanity would be able to slam ME in a week.
Forerunners would be able to wipe the floor with ME within a day.
Precursors would be able to laugh and put them out of their misery within a few minutes.
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The UNSC is a joke. They're not even factored into the equation on the factpile discussion anymore because the only weapon in a space battle they have worth a damn is the Super Mac, which is limited to stationary platforms.
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I know, but they have 300 of them. If they get to bring them, then they'd do quite a bit of damage. That's why I said that UNSC would [i]maybe[/i] beat them after a long fight. Covies have their goddamn energy projectors and sheer numbers. Ancient Humanity has some next level aggressive d1ckery. Forerunners have Fortress class vessels, one of which would probably be able to upstage the entirety of the Reapers. Precursors have literally indestructible material and solar system sized constructs.