[ironchef]

A number of people have been bit by issues in mongo in the past such as: the approach it had taken to write locking, that it has silently discarded writes in certain cases, the charge that it uses inflated storage on disk, and the performance characteristics when the working set does not fit into memory. I'm sure there are more but when it arrived it had great marketing as was touted as the greatest thing since sliced bread. Unfortunately, some people ended up with horrendous sandwiches and remember the awfulness of said sandwiches.