RedSwirl said:
Okay so since I've found it impossible to keep my KDR above around 0.4, I decided to start playing with bots until I can actually learn all the maps like I used to on TimeSplitters. Even playing with bots on hardened I still feel like the worst player in each game.
My only advice would be to take it slow. When you're in a match, go slow and try to play at your own pace and now the pace of your teammates or your opponents. I've seen countless players run around like chickens with their heads cut off, only to get cut down again and again.
Combat training does help, but I agree that playing on Hardened or Veteran probably does more damage than good. If anything, play on Recruit or Regular and really take the time to learn the maps - find and identify places you think would be good hiding spots, choke points, etc. Practice targeting enemies while they're moving and then practice shooting at those moving enemies. Really take the time to find a loadout of weapons/perks/equipment that feel right to you.
It'll take time, but you'll get better. Trust me. Just take your time, practice, and get to know the game better, and most importantly, get to know how you play the game.