Half-Life's multiplayer aspect was not heavily concentrated on according to Valve. Half Life's shipping deathmatch play is good, but nothing stellar. It is relativley choppy even at decent pings. Aside from that deathmatch is very good, but needs some work still. Half-Life's interface, controls, and menu's are very well done and are easy to navigate and understand.
All controls are completely customizable.
Just like Quake and Quake2. No complaints here, a job well done. Graphics Half-Life was originally developed using the Quake engine, then they moved to the Quake2 engine. Half-Life's final engine is almost a complete rewrite but still contains bits and pieces of Quake and Quake2. Well, Half Life looks nothing like Quake or Quake2.