I like to read and do reviews and I usually find that "too localized" as the reason mostly used as a flag. There is subjectivity in the matter and I personally believe that if a question involves using and implementation of GIS software and/or science then it is worthy of the attention of this site.
On the other hand, some questions are about installing a specific version of a GIS software on a specific platform or using a particular GPS model with a particular software. Although, these type of questions involve GIS, the primary problem is not GIS related and therefore could be considered too localized.
On a third note, since some of the GIS software is purchased or not updated as frequently, questions involving postgis 1.4 or ArcGIS 9.3 will be relevant for a while as not everyone is purchasing or implementing upgrades. Dismissing a question because of the version of the software is unfair in my opinion
On a fourth note, this site is primarily about the usage of GIS software and systems vs mathematical, scientific, statistics, and GIScience, therefore it's harder to identify which questions could be considered as too localized