Good and bad

Good
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The game uses very little graphics effects and hence can even be played on a older Macbook Pro.
The artistry is good.
The game is simpler to play then most FPS.

Bad
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Keyboar bug. WASD movement keys get stuck.
The multiplayer ability has been disabled.
Single player is very boring.
Over priced for a old game with no multiplayer.

Ran game on single player at 1366x768 on the highest settings.
Smooth, no noticable lag.

2010 Macbook Air
4GB RAM, Nvidia 320M (256MB)
1.6 GHZ Core 2 DUO
OSX 10.8.2

Further tests.

Went ahead and tested it on a Macbook Air 2011 with Intel HD graphics (4GB RAM).
Performance was much worse then the older 2010 Macbook Air with nVidia.
Even on lower resolution (720p), the Intel HD GPU had issues.
All settigs for both tests were set on max except the resolution.
It seems the game relies more on GPU then CPU. Even with the more powerful i7 procesor on the 2011 MBA, performance was worse.

Pauses and laggy graphics on the Intel HD.

Conclusion
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If you like this game, get the Windows version.
This way you get better performance and multiplayer.
Not recommended for people with Intel HD graphics.

Observer2010 about BioShock 2