The Raze campaign has you constantly shooting, with just different enemies. Is that not repetitive?
Nope, considering there's always new things to discover like harder AI, new maps, different weapons, different teammates, playing to unlock the next part of the storyline, etc. Have you tried it?
The Colony multiplayer often has the same units being used, same strategies..but this one is a bit more unpredictable, I will give you that.
Yes. I have tried Raze. In my opinion, all those "non-repetitive" qualities are minor. But then again, you are entitled to your opinion despite the fact that I disagree.