Woo, no changes to the inherently crazy artificial difficulty... (aka repawn time, spawn location choice, enemy bullet-spongieness, req level/energy speed, req ammo, aimbot enemies, crazy low durability of our own Spartans and vehicles, the fact that reqs are NEEDED to succeed, etc.)
wait a minute, not only do you want the overall difficulty reduced, you want to be able to complete all five rounds with just your standard loadouts? Why the hell would you want that, it would be -Yoink-. Why would you not want power weapons for a gametype like this? That's the FUN of it.
Honestly, aside from the respawn timer and the odd poor spawn, I just do not see the difficulty problem at all. I just can't help but think it's the less-skilled side of the community expressing this view. Try playing firefight with a team of eight good/very good players - it's insanely easy - I don't even have to try. Just an army of tanks ruining everything.
I just hope 343 doesn't give in to the moaning that it's too hard. I'd stop playing it if it got any easier.
And as for bullet-sponge enemies - this was clearly a design decision they wanted to take, I'm guessing to help draw in the destiny crowd. Either way I don't mind it - there's enough non-boss non-bullet sponge enemies on the map at anyone time that it just doesn't matter. Besides, it's actually quite fun to pound away at an eternal warden with a team full of ultra rare tanks, to break up the monotomy of endless elites and soldiers.