A media centre is meant for news, film, and corporate production and can be used in a variety of ways; It should be able to comfortably accommodate at least a small group of people, if not a larger gathering. Some might use it for watching live broadcasted events also.
It's really up to you how you want to utilize a media centre. Its primary purpose is to provide a comfortable area for groups to socialize, so if one is available to you, consider using it for your next gathering instead of cramming all of your guests into your apartment.