It is popular, but I haven't played it but I would probably like it. Here are the top tactical rpg's I know of...

http://en.wikipedia.org/wiki/Tactical_role_playing_game

Ogre series: Ogre Battle, Tactics Ogre, Ogre Battle 64, Ogre Battle(for a handheld console), Tactics Ogre: Knights of Lodis

FF Tactics series: FF Tactics, FF Tactics Advance, FF Tactics Advance 2(upcoming)

Nippon Ichi tactical rpg's they developed: Disgaea 1, La Pucelle Tactics, Phantom Brave, Makai Kingdom, Disgaea 2, Makai Wars(upcoming)

Series: Fire Emblem, Shining Force, Front Mission(Squaresoft)

Also, Bahamut Lagoon(Squaresoft) and Suikoden Tactics are signifigant, read that article.