Steam Web API/Feedback
Provide more information about player profiles (like the old XML interface)
ISteamUser should either have another method to get the entire information about a player (e.g. friends, groups and games) or
GetUserSummaries should provide these (with an optional argument):
Provide games information
There should be something like
ISteamGame to retrieve information about every game available on Steam. One method to get all games and one for detailed information about one game, e.g. name, publisher, achievements, store link etc.