It works well for groups of up to 20 people
but the wheels fall off if used for large numbers of people
No. This "truth" comes from observation and hearsay of poor installations based on SharePoint's WSS version and no design work – when this happens it becomes like Microsoft Access database proliferation all over again!
(b)
It is really designed to be used by teams not organisation-wide
Yes and No. The WSS3 version of SharePoint is more of a team tool, but the MOSS version is absolutely for organisation wide use or even virtual organisations of partners, customers and contractors.
(c)
Its OK for organisations of up to about 200, then the complexity makes it hard
Sort of. You definitely need to do much more IT infrastructure (get third party help or talk direct to Microsoft) and information design
(d)
It is only OK for single site organisations
No. One of SharePoint's strengths is its ability to work over the web. However, you will need to do much more work on IT infrastructure and you will need good bandwidth for corporate use, or use extension products like Colligo for offline use.
(e)
It can be configured for multi country, multi site large scale usage
Yes it can - it requires extensive IT infrastructure planning and careful deployment – as would any large scale web delivered application
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What version
of SharePoint?
SharePoint comes in different versions. The "WSS" version is bundled with Windows Server software, and has the base functionality for creating sites, doucment libraries and lists.
The "MOSS" versions include WSS and also allow enterprise functionality including cross site search, Active Directory integration and "My" site
Here is a handy reference document from Microsoft that compares the different versions
