With all of the Eldar rumors circling about, I have seen a lot of players trying to justify that the change to distortion weapons to Strength D is no big deal. I have seen players ask rhetorically things like: "what used to survive a unit of Wraithguards shooting, anyways?". The answer is simple: Imperial Knights. The new Eldar rules make Knights a complete liability, because a "6" on the damage table kills the Knight instantly with no recourse (as it bypasses its Ion Shield and any cover it may have). This means that a WraithKnight (with dual Wraithcannons) can avoid the Knight (with his superior mobility), searching for that magic 6. When it comes up, the Knight dies. With 2 shots a turn, that 6 is likely at some point in the game. Multiply this by mutiple WraithKnights, and a problem arises. Honestly, the Wraithguard are worse, as getting one of these 6's per squad's salvo will not be difficult. So, what's the problem with massed S: D? It makes large, single unit models a liability. Knights, most Monstrous Creatures (like Riptides as the 6 bypasses their shield as well), heavy tanks like Land Raiders and Monoliths (not that they were hyper-competitive anyways), and many more besides. Funnily enough, even WraithKnights (as the first player to roll the 6, kills the other one). That's not even mentioning how much more efficiently the 2-5 on the Destroyer table deals with Monstrous Creatures and medium vehicles than the old S10 rules.
Are there ways around this? Sure. Don't bring these large, expensive models. Cast Invisibility (that solves a lot of things, actually). Maybe something else? (I don't know, I can't think of anything) But, should you have to? Should a single Codex and a couple of models dictate so much? Maybe its always been like this, to some degree. It seems worse to me though.