I've noticed every time I'm on there's at least one player abusing the predator's cloak.
Much like hellfire missiles and EOC mines, the cloak offers yet one more thing to exploit for "easy" kills.
To the powers that be, I implore you to take a look at the sniper's cloak in Killzone 2.
The way it works is based on the sniper's movement. When the cloak is activated, the sniper is completely cloaked while standing still. However, if he moves, the cloak becomes partially active (random parts of the sniper are exposed). So he's still cloaked but just a bit easier to see while moving.
I really think the predator's cloak would be a little more balanced if it worked this way. Invisibility is a HUGE advantage. Never mind being able to see through walls. (I think seeing through walls should be its own ability for a different mech entirely. But that's just me.)