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Infiltration as it worked in Winter Assault was perhaps realistic, but it was too poor. For those who don't know, as stealth unit was invisible until it A) was detected by a detector, or B) fired a weapon at which point IIRC it became visible for some time.
Infiltration in Dark Crusade and Soulstorm is IMO too powerful and highly unrealistic. It's possible to get completely raped by stuff like stealthsuits or cloaked monolith without any chance of retaliation, because certain races have inadequate detection. It's unrealistic because how the hell wouldn't you fire back if you saw shots coming from a certain place? You would perhaps miss a lot but at least you'd not just stand idle while fired at.
For realism and a lesser "omgwtfpwned"-factor I'd like to see something different in DoW2.
My initial idea is a mix of WA and DC infilitration: A stealth unit can have 3 different visibility states: 1) Completely invisible: The unit cannot be seen at all by opposing player or his units. This is the default state as long as stealth unit isn't seen by detector or is firing. 2) Partially visible: This state is activated whenever the stealth unit fires. It makes it transparent to player, and his units may fire at it. However, there's a -50 to -75% accuracy penalty when trying to hit it. (Potentially variable depending on unit, monolith should be easier to hit than a stealthsuit squad.) 3) Visible: Stealth unit can be fired at without accuracy penalty. This state is activated when stealth unit is seen by a detector.
The aim of the system described above is to avoid the completely absurd situations where 2 or 3 stealthsuit squads can totally level a base filled with defenders.
Note: I don't hate Tau, I just took stealthsuits as an example because they're the most obvious.