Dynasty Warriors 7 is the second game I have played in the series (the first being Dynasty Warriors 3) and while they both are based on China's history of three kingdoms they are both very different games. Although with some big similarities.
While the game play is rather fun and exciting, it does get boring quickly (especially if your playing it on easy) as the hack and slash style of the game is quite repetitive and the maps on which you progress through are rather long.
Like other games in the series (as far as I know), all your characters (there are many you can choose from) have life, health, attack and defence stats. These can be quickly leveled up from killing significant enemies in each map.
There are also many weapons categories in the game which characters can level just by having the weapon equipped. Each character can only equip weapons of some categories but not all.
I would recommend this game to anyone who enjoys a good hack and slash with a variety of weapons, good levelling system and plenty of maps to choose from.