@mardinn -- I never compared StarCraft II to a role-playing game. How on earth did you come up with that?
Most RTS games include multiple campaigns for different factions. SCII is an RTS, and therefore, gets compared to other RTSs. Even less interesting strategy games--Universe at War, Maelstrom, and so on--have multiple campaigns! Therefore, it is absolutely legitimate to call out the single campaign as a minor drawback. It isn't as though I harped on it ;)
Did you know I have received messages from people that thought I should make it a bigger deal? If that tells you one thing, it's that no review will tell everyone what they wish to hear. If I tried, I'd probably go insane!