Okay one thing ive noticed. if you dont pick the correct class for an objective the objective wheel says guard gate or defend gate depending on wich side you play. this is soooo missleading imho. Why does it say guard gate if your team is supposed to blow it up?! Thats not very intuitive imho. And a lot off ppl are very confused about that. Guess guard means your on the team who wants to blow up, repair etc the thing and defend means to really defend that? (or vice versa?!)
im playing the german version. What are the translations for guard and defend (bewachen und verteidigen ?)

at least everyone gets it than. i did it myself. Guarded the gate 4 min until i swaped to soldier to see that we had to blow it up xD