As many,have said on here - do your daily missions. Complete those you can, and if there is a mission you don't like, just change it for free, or if you already changed it, wait for the nightly server reboot and you can change it afterwards. In CTF always go after the flag. You will get destroyed a lot, but you still get points depending how far you brought the flag. If you die and your teammate caps it, you still get points. Also, you might need to get a high DPS combo to be competitive - Predator and Firefly come to mind. Bottomline, whatever game mode you play get as many kills as you can. D/L stats have no bearing on your overall success/failure.

Domino looks like a sequined dress.