The update sure made a difference in the co-op game we played last night.
1)The Titan seems a little more "intelligent" now, doesn't walk into the walll anymore, but needs to be more vicious.
2)The enemies were more in number, more aggressive, but I don't know if that was due to the patch, as the cgames are randomn everytime.
3)The gameplay felt much more frantic and fun due to the increased aggressiveness, and we had 4 titans where there used to be three earlier.
I had much more fun last night, it felt more like R1 single player due to the chaos! If it gets the speed and frantic feel of R1 SP by launch, then this Co-op will be the best thing to happen to a shooter
!