I will copy my other post below, it may answer some questions but I wont deny existence of cheaters, as that is also truth, though havent noticed anyone cheating yet (lvl 60, no XP boosts).
If you are cloaked you generate A LOT of noise, I mean FREAKING GOD DAMNIT MASSIVE AMOUNT. It is also nicely direction too, allowing you to exactly pin point the location of the pred.
If you want to sneak up, dont use cloak.
If you want to engage but not be as visible, use it.
Cloak can sometimes be harder to see on brighter backgrounds (sky).
But really, anyone with a bit of gaming experience will pin point your location if you sit cloaked nearby and will indeed light you up.
Personally, I dont cloak as much as Scout, whilist getting closer to the FT, where I can harass them with a bow, disc if they happen to be hiding inside or plasma caster if they do group up in a obscured location (aoe). Only using cloak if engaging them and needing to lose the aggro by standing still and letting them run past me so I can retreat or just to create a bit of chaos.