Not 2; that's a whole different beast that was not well received. Play Supreme Commander: Forged Alliance, which is more or less v. 1.5, and widely considered to be the pinnacle of the series.
The original Supreme Commander is not bad as well and interesting if you want to see the storyline that Forged Alliance sprang from.
SupCom 2 was hot trash. An attempt to make an RTS xbox friendly. Some of the worst voice acting in decades of gaming.