Hmm, I think passive is not as good in 0.3.2.
Mainly because there is less reward for flanking (since high back armor values right now makes it useless to go for back armor alphastrikes).
For me:
I mainly stay in passive without ECM and ping once in a while.
If I have ECM, I'll scout for my passive teammates and call out positions.
I like being passive as missiles can't lock onto me as easily, mainly. And of course, if there are Longtoms, I'll keep my radar passive.