Honestly I've been through that game so many times already it's made me sick.
Heh, favorite weapon? I am happy they brought back the Assault Rifle, and as the default weapon I tend to use that on the rare occasions I play online.
The Battle Rifle and Carbine are both pretty good. But you gotta know how to pull off a head shot to really use em.
Frankly, I still go with Dual Plasma Rifles if I can. They tear shields apart like no tomorrow and can drop enemies just as fast.