Korea hasn't been this busy since 1950.
-Gameplay focuses on both speed of mind and speed of unit management with a lesser emphasis on overall planning and strategy. It has a way of making most players sweat.
-Terran, Protoss, and Zerg races are well balanced and distinct. Each one offers a different style of play that takes time to learn and master.
-Worthwhile story leaves a lot of room for the next chapter.
-Amazing graphics for an overhead RTS game. Nuclear explosions, invisibility, and searing enemies in half add a lot to the experience.
-Challenges are well designed, it takes patience to achieve gold, but they teach you vital concepts such as how to counter unit types.
-Achievement/portrait/ranking system is pretty decent. Some good options for online play including six different levels of AI, it's easy to start up a match with or against friends.
-Good unit and ability variety with multiple counters and specifically powerful uses.
-Blizzard's cinematics and voice acting quality meets and exceeds expectations.
Bad:
-Single player campaign is a bit short and focuses almost exclusively on Terran, but I guess that's what expansions are for, right?
-There's a pretty big learning curve that may turn some players away.
-Some of the unit sound effects are subpar and can get annoying. Why do mutalisks sound like eagles?
-I sometimes find myself wishing I had a hero to set rally points onto and gain experience with in multiplayer, this was the best feature of Warcraft3 and I'm surprised they opted not to include it here.