I got roughly the same feeling from doing the first few invasions that I got from the zone invasions in Rift(which were 100% responsible for me buying that game and playing it hardcore for 3-4 years). Now, the invasions are NOT dynamic, but in this case they don't have to be. I like that the lore behind it is that the Legion is carefully deciding where it would be more advantageous to strike and are slowly building up momentum by poking and prodding. All in all, I think this is the best pre-expansion event at least since Wrath to me and, again, to me, is the best one overall.