The basic premise of the game is to destroy the other teams Nexus. Sounds easy, right? Not so much. Teams are split up into 5v5 or 3v3, with a different Arena for each. Summoners (you and your teammates) choose their Champions before the battle begins (following suit with your typical Tank/DPS and Ranged/Mele fighting classes). There is also an in-game shop where you will spend the gold you earn by killing enemy minions and other Champions, on increasing your own Champions stats. There are also enemy turret towers along the way that shoot heavy damage dealing blows to anyone that get within range. The good news is that when you manage to destroy a tower, it cannot ever be re-spawned, whereas the bad news is that usually only a few hits from one kills you and forces a re-spawn at home base.
The in-game graphics are superb on my 18" 1080p laptop. The colors and edges are very vivid and the game runs incredibly smooth. I would say that anyone with a decent graphics card and at least 1Gb of Ram will enjoy smooth gameplay.
League of Legends (or LoL to those who play) is an incredibly team oriented game. If one person is bringing the team down, then two must work to pick up the slack. Only in rare cases can a pro carry an entire team.
Give the League a chance. I promise you won't be disappointed!
My in-game name is GhostL0rd. Go ahead and add me if you are in need of questions or advice, or are a veteran looking for a pro teammate. ;D