That's pretty good work there. I especially liked that spiraling shot of the Titan and that last shot, with that debris piece flying towards the Camera. Those were really epic.
As for criticism, well..... The battle in the beginning lacks context, and it seems weird to me that that Orion is so far out of position, but that's more in the realm of story than actual execution. From 0:54 to 1:00, there's a bit of dead space waiting for the Titan to warp in, which should be removed to speed things up a bit. Similarily, the shot from 1:34 to 1:47 lacks dynamics, there's just nothing going on except for a titan in the foreground sitting around charging its lasorz, which gets awesome eventually, but just isn't very interesting for quite some time.