League of Legends (or LoL for short and for fun) is huge. The Dominion update is only going to make it bigger. This is the most addictive game based on the famous DotA mode and is likely to stay that way until Valve releases DotA 2 – which probably isn’t going down the free-to-play route and will still sell truckloads of copies.
There are other similar games such as Heroes of Newerth and Bloodline Champions, but League of Legends has millions of players to vouch for it. It’s a clear case of a F2P game that wouldn’t be anywhere nearly as successful if it was released as a retail game.
Editor’s note: in your opinion, what is the main appeal of a MOBA (multiplayer online battle arena) game such as League of Legends?