This forum seems to like eating my posts. I've tried to write replies 3 times to this thread. Let's see of a cleared cache fixes it. A lot of what I wanted to say has been said by others already, so I'll just address one point that's come up a few times:
Not sure why so many people is against the fact that hitting always on a 5+ would negate the others armies special doctrine/tactic/whatever. It isn't like there were no other mechanism that negated something. Think of the poisoned weapons, mortal wounds, heck! Even the very same -1 to hit negates ork shooting!
These things are usually unit specific, not army wide. If you've got a unit like say Flash Gitz, and give their Gitfindas the special rule "ignore negative to hit modifiers", then I would be all for it. This seems fluffy, and it does not break the opposing sides special rule, it just means that one unit is strong against it.
If you make it an army wide special rule though, you're basically negating something that the opponent paid for completely, with your entire army. It would feel bad for your opponent, who would then feel like they've just wasted points. Sure, there will be units that are better or worse against some armies, but making it so that something just flat out does not work against an entire army is never a good thing.
I found a video here where the host talked about what playtesters had told him, and it basically sounds like GW has massive issues fixing orks. Any attempts to make orks viable makes them overpowered against some armies. It really does feel like GW has painted themselves into a corner with this edition, and can't figure out what to do with melee armies, and orks in particular due to how they've written some of the previous codexes.