Grand Theft Auto IV is a 3rd person open world action adventure game.
SpecsUpdate
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Pros
Pro Supports arbitrary framerates
Framerates can even exceed 120 frames per second.
Pro Up to 4 player online co-op
There are multiplayer games built into GTA IV (not the story mode) that have up to 4 online co-op players such as Hangman's Noose or Bomb Da Base.
Pro Detailed story and world
Grand Theft Auto IV has an extremely detailed world as well as a intriguing and well written story.
Pro Cabs
For those that do not want to deal with the inconvenience or danger of driving across town there are now cabs that will take the player to certain waypoints on the map.
Pro Social commentary through exaggeration
GTA very smartly critiques many aspects of the modern world through exaggerated situations and plots.
Cons
Con Very poor performance
Con Frequent crashes
Playing the game can lead to crashes at any time, which can ruin the amount of content played if it was not saved as well as just cause a lot of headaches due to fear of being booted at any time.