I just had the best game as House Targaryen. I started as Daeron the Young Dragon and he had a bunch of kids: Rhaekar, Viserys, Vaekar, and Aerys. Aerys became a Kingsguard knight at 14, had an affair with a courtier at 17, which Daeron overlooked and the bastard was named Aenys. Daeron dies of a winter illness, leaving Rhaekar as king. Vaekar marries the LP of the Westerlands and his son Vaekar II inherits that. Viserys tames the dragon of Driftmark and becomes a Dragon Rider. Aerys the Kingsguard Knight tries to usurp his brothers crown, and in the ensuing war slays two of his sworn brothers before being captured and sent to the Wall.
Rhaekar during the war gets a knock on the head and needs a regent. Viserys happens to be that regent and starts a war for the crown, landing 28,000 men at Dragonstone where Prince Daemon II, heir to the Throne lives. Daemon and his son get burned alive leaving Daemon's daughter to reign there, and becomes a lunatic after witnessing her brother and father get burned to death by Viserys' dragon. Ser Aros Blackmont, Lord Commander of the Kingsguard captures Viserys in battle and Viserys is sent to the Wall with his brother Aerys.
Daemon II would have been a great ruler but his uncle killed him, causing Rhaekar's second son Vaermon to inherit. It was amazing.
So... Is that a victory or a loss?