Detroit's secondary has been a problem for them for a long time. Combine that with sloppy QB play, combined with spectacular QB play... it's been enough to sink them.
Their OL isn't great, but good enough; and their front seven are much, much, better than ours. Of course Megatron, Bush, Bell, and now Ebron?? They're better than we are at the skill positions - sans QB.
They are entirely capable of whipping the shit out of us next week.