Shameless plug: I wrote a blog-post detailing how to do exactly that using Wineskin:

http://marzzbar.wordpress.com/2012/11/06/how-to-play-classic...

Not sure how the improved driver for Mac makes this better or worse.

Out of curiosity, does multiplayer work? My main concern is LAN/Battle.net.

Worked for me.

Battle.net is a little shakey. Make sure to follow the steps to install fonts, or it won't work at all. Also, it'll probably look really funny (textures won't load properly), but it'll be functional.

Carbon applications still run on the Mac, they just can't run in 64-bit mode. But Starcraft 1 is a PowerPC app, so it does need Rosetta.

Which was disabled starting with Lion in 2011 :)