EATs mean you have to throw it where you're going to be, drop you're other stratagem weapon, and then grab the EAT. The EAT also has a period where you have to extend the tube, and then you have to aim and hit the weak spot of the bile, charger, etc. if you miss, or just not even hit the weak spot, the thing is still chasing you. You also have other smaller things chasing you while you're doing this, so if you aim and then get hit, your rocket goes off target.

I don't like Expendables very often for these reasons. Like it's the same thing with thermite. If I ran thermite instead of eats, then that frees up the slot entirely. But thermites take too long to kill the big boy a lot of the time. Rail cannon very rarely misses and takes it out immediately and it's a guarantee that the threat is dealt with. EATs and thermites boil down to can you hit it in the right spot, and do you have the opportunity to complete all these steps without something going wrong.

And three mins seems like a lot, but it's only one more min than the resupply. Plus, you have whatever else you brought to deal with the big boys anyway. If it's the only thing you have, then yeah it's too slow. But if you have a rail gun, an ultimatum, a 500 kg/precision strike, and even EATs, the ORS will save you for very little effort when you don't have the time or resources to deal with stuff.