Starcraft 2 : Wings of Liberty [Mac/PC]

Play it for:
* RPG elements make this the best and least linear single-player campaign from Blizzard.
* Best plot and characters of a Blizzard game too, and a couple of goosebump moments.
* Revamped Battle.net mode is kinda awesome.

Avoid it for:
* Long load times, and greedy for RAM/processing power.

Sam & Max - Season 2 [Mac/PC]

Play it for:
* bigger & better episodes than season 1.
* puzzles are much more innovative (time paradoxes!) and less frustrating too.
* all ties up into a fantastic finale with tons of great moments!

Avoid it for:
* still buggy as heck.