This initially caused me to have to go to the map to see where my objective was because I couldn't find it on screen.
Also on one of the campaign missions I was told to grab a rifle from a squad members backpack, and ended up running off without a rifle because I couldn't work out which backpack I was supposed to be looking in. Didn't help where it was at night.
Making the objective more obvious on the screen (or allowing it's colour and transparency to be edited in options) would help a lot.