Plot wise, this is the best homeworld you could buy. It's not as emotional as HW1 nor as grand as HW2, but it's gripping for sure. It's a thrilling underdog story and the gameplay ties in perfectly with the plot. If you were dissapointed with HW3 like I was but never played Catalysm/Emergence, do yourself a favor and give it a play through. Your remastered knowledge should serve you well enough if you've never played the classic games.
