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Without the normal orbital support they bring, we'd probably be ok. Except maybe Tyranids and depending on your fluff, Necrons. We'd win against Orks, but we'd never really get rid of them. Orks and Tyranids can multiply quickly, and some fiction indicates Necrons don't need a spacecraft to supply reinforcements.

But in "reality" most factions will also have a spacecraft, and in that case we pretty much auto-lose.

 JohnHwangDD wrote:
40k doesn't even use targeting computers.

In 2nd Ed every marine with a heavy weapon had a targeter giving a +1 to hit. Same with all Terminators.

It's hard to make a comparison because 40K tech is such a mishmash. Earth doesn't have directed energy weapons like the Imperium does, nor do we have spacecraft anything near the capability of the imperium. But the IG ground forces seem pretty crude at the same time.

Technically, the Imperium has a much higher technological level. But they use it in incredibly backwards ways most of the time.