I put my commute in:

Suggested I ride down a very narrow, steep road with zero shoulders...one I would never consider riding down.

Suggested I exit a paved bike path and cross over a river and continue on a unpaved path on the other side.

Took me down a road that has been closed for construction for a year (and will be closed for another year).

I provided feedback on these issues using the link at the bottom of the route.

I give Google a A+ for providing this feature, but only a C+ for implementation (so far). Hopefully more people will provide feedback, the feedback will get incorporated, and this will become a really useful tool.