What we have come across is that some governments have had some hesitation in opening up data sets, for privacy and security reasons, but also for quality-related reasons, meaning that data sets that have been collected for a long time are not always of the quality, in terms of timeliness and of accuracy, that is required, for instance, by the community to reuse the data.
There are concerns in that sense, but I think the more we move ahead in the implementation of open data policies, the more those concerns can be tackled.
I hope this answers your question.