[gte910h]

As a person who talks with people at corporations about stuff like this (heroku vs gae vs ec2 vs corporate data center is a huge discussion these days in the business community, even for non-consumer facing sites and backends to non-web projects):

They hate 2 features of rails in the conversations I've had: The fact rails devs seem unwilling to take shortcuts that Django/other python webdev guys will. They also hate "It is just broken", which seems to come out of rails guys in their experience more. Note these are entirely non-technical and come from a open ended menu.

Also, my particular town has a pretty large python community (we hosted pyCon in 2010 if you went, I wrote the initial bid).