OK, then I will say it. Assault Engineers are shitty. They are a 4 man squad with terrible received accuracy that has to fight Axis faction which have very good DPS at all ranges until close. Losing just 1 model makes them useless, as they have to immediately be retreated after the battle to be useful in later engagements.
They may have good DPS in theory, but good luck getting in close to use that DPS. You are better off getting a riflesquad for the same price. Assault Engineers are useful for 1 job, anti-building, and even that can be done by riflemen.
They have 1 use, which is demos. As a USF player, I will tell you that demos are NOT easily paid for in a faction that requires more munitions to fight in the early game (grenades and smoke vs. MGs), and to scale into the lategame (upgrades), than any other faction.
Wait, why are we talking about these again?