I know a lot of people who would die for a native port of Halflife. Playing it in wine is not playing it natively.
Sure, Doom 3 and Quake 3/4 has native clients, but even doom or doom 2 didn't have native ports done by id software. The engines where later ported to Linux, but they have never been officially released for linux (I'm pretty sure quake and quake 2 hasn't either). Halo is a Microsoft game - why the hell would you ever expect it to be released for anything BUT windows and xbox?!? Again, you can (properbly) play it under wine but that doesn't amount to a native client.
Would it kill you to take two minutes on google.. gezz..