Microsoft has a whole range of security products under the brand "ForeFront"; the only one of them which has firewall capabilities is ForeFront Threat Management Gateway 2010, though, so I'll assume this is what you're talking about.
ForeFront TMG 2010 is the successor to ISA Server 2006, and as such is a full-featured firewall and web proxy product. It is indeed a very powerful product, but it's a network firewall, not a host one; it would be quite overkill to install it on a single server in order to lock it down.
If you only need to protect that server, the built-in Windows Firewall is definitely enough.