Just want to counter the very negative voices in this thread to say I really like the direction this expansion seems to be going. The whole point of this expansion was meant to be a horizontal increase in power. If you're already maxed out for one role (tank, DC caster, melee dps etc.), you're not meant to get much more power in that role from this expansion. You should be looking at how to shore up some weaknesses or expand into a secondary role. Very few will use 7-piece sets, true; but very few builds will use any specific number of set pieces. This is because of the vast array of build and itemisation options in the game.
This expansion is meant to offer flexibility in gearing options, not a new OP set that everyone of a certain archetype will want to go for. It is more for mixing and matching. At this, the loot in this preview will excel. Personally, on my hybrid build, I am salivating at the gear options that will be available. At bottom, the sets and augments just look like great fun!