For reporting we uses Harvest reporting service and Google Analytics.
One thing I learned was that the support of Telligent is not good and also the first releases of CS2008 was buggy, some parts didn’t work at all!!! And don’t even get me started about Telligent Harvest Reporting (Just don’t use it).
If you need to start a community be sure to check if you really need community server! If you only need a forum use: Yetanotherforum.