Macworld UK gives Apple’s Mac OS X 10.5 Leopard Server 4 out of 5 stars
Monday, February 25, 2008 - 01:16 PM EDTGiving Apple's Mac OS X 10.5 Leopard Server 4 stars out of a possible 5, John C. Welch reports on what he sees as the new OS's pros and cons for Macworld UK:
Pros: New Calendar server; built-in wiki and blogging services; simpler installation modes; improved administration and monitoring tools; better cross-platform integration.
Cons: Many services don’t work well with non-Mac clients; GUI administration tools can be limiting for experienced administrators; some features available in simpler installation types not available in Advanced installation; limited client support for CalDAV and iChat Server.
Welch writes, "Is Mac OS X 10.5 Server worth the £319 [US$499] retail price (for the 10 file-sharing user version; an unlimited client version, no CALs required, sells for £629 [US$999])? (If you buy a new Xserve, you get it for free.) It depends. If you don’t already have a directory service or dedicated servers, and are just now thinking about implementing such things for the first time, Mac OS X 10.5 Server is a compelling product; just keep in mind that some of its services don’t work as well as they should in a heterogeneous environment. On the other hand, if you’re an experienced administrator, you’ll likely be frustrated by the limitations in Apple’s GUI server tools; fortunately, OS X Server is based on Unix, so you can have all the control you want via the command line."
Full extensive review - recommended - here.

You'd think since its Macworld they would rate it higher.