Atlas can lose to 2 good scouts, but i think it should be so. Atlas without support is stupid atlas
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. I often die without support but i don't blame the game balance for it, i blame my stupidity.
If you got 2 atlas and 4 scouts, and atlases lose, then you can blame the another atlas or yourself. Scouts are good destroying singled out enemies, but they tend to lose quickly if there are few mechs against them. You just need firepower and good hit to leg and the scout is history.
I think the balance is quite good at the moment, if i'm with few mechs, i have nothing to fear from scouts, if i am alone, 2-3 scouts will make mince meat out of assault quickly. In that situation i usually just try to leg 1 or 2 before i die, scout with 1 leg is dead scout. I get my revenge beyond grave.