the hammerhead can take practically no damage, but, if you stay at a distance the geth never fire back. plus, there is only two missions where you actually fight anything in the hammer head. the one your on and then the final mission, but, the rocket drones are relatively weak. just dont run them over as im sure itll kill you in insanity
if the pulse rifle only available in insanity or did it become available after fully upgrading a weapon? normally in talis recruiting missions, the pulse riffle in talis room on the ground is scan only. this time i was able to pick up which means im going to take assault riffle training when the time comes.
right now im using tali with her exploding combat drone with grunt and squad inferno rounds. when i get legion ill switch grunt out for legion and have two exploding combat drones.
im finding that i need to use class special skills are actually needed. for instance, singularity, will hold anything in place and keep them from doing anything on anything up to a scion (big metal thing that fire shock wave at you). But, anything stronger like a geth prime, heavy mech, and flying mech with laser eyes are unaffected until all of their armor/shields/barriers are down.
i wish i could get legion sooner

what would be even more awesome is if they release extras skins that gets rid of the whole in his chest. i just want to walk up to it and reach my arm through

probably get electrocuted though
i dont think im going to do insanity again though. its not hard just frustrating. i nearly killed the warden the first time as i knocked him down with the arc projector, turned to the right, shot someone else and with out touching the left thumb stick i was magically out from my cover and he lit me up. i died before i even knew what happened.
[edit - i wonder what the update did ...]