Dont get upset about not beeing able to use cloak because someone have to use oracle.
Cloak on PUG is just to do some kills, Flanking almoast do nothing but gives you free kills. Most of the time ppl dont even recognize that the enemy is gone so oracle is the better choice anyway.
I for myself use cloak only to break enemy bunkers down when i got fearful assault in my team ...
That gives a higher survivability for a short time but even then you only delayed the next push of the enemy.
In my opinion (after more than 45h of recon played) when you have to use cloak to do some harassment, something basicly going wrong with your team/mates.