The way they do the scoreboards for online is, one for everyones total score and then one for each of the game types. It kind of sucks that the main board is already compromised and cheated scores are showing up and not being deleted... At least the individual boards still appear clean. Blech...
Anyway... I've been playing Team Death Match. I suck but I play a decent amount so I'm steadily moving up the boards, I just got into the top 100k. What I am using is:
Primary Weapon - HBRa3 - An elite version of the weapon with extra damage (+1) and fire rate (+2) as well as lower handling (-1) but it's fully auto with 30 rounds before reload... Enough to take out two. I vary two attachments, swapping out as I complete the challenges but once I have them all, I'll stick with the Quick Draw Grip, that lets me aim down the sights faster and the Foregrip to reduce recoil. Makes it very accurate, even at a good distance, plus you aim wicked quick.
Secondary Weapon - I leave this empty... You can only use 13 slots and you can always pick up the weapon of the fallen, they are plentiful.
Perks - Again, all of these rotate to get the cards from the challenges (the cards are displayed if you get something special during the match or the round ending kill and I guess bragging rights go to those with more difficult ones to get... Like fucking pokeman, I gotta get every fucking one, heh) but I'll settle on either Danger Close (more explosive/score streak damage) or Flak Jacket (explosive protection) for the first... Gung Ho (shoot while running) for the second... And Hardline (score streaks cost 100 less)
WildCard - (skipping the swapping part) I really like Bombardier... It makes me give up an exo suit ability but I get an extra grenade and it can be different from my other two, so I use a Stun (great for clearing fortified positions)... Which leads to my main two grenades... I love, love, love semtex baby
Two slots of sticky joy.
I also use three score streaks... The first at 300 points (100 per kill, 50 per assist)... This shows everyone on my team where the enemy is... Helps me find one more kill to lead right into Orbital Package at 400... A gift from the skies that could be almost useless or freakin awesome but always a bonus you hope leads to Goliath (a very cool armored suit of death)
I've been using this set up for the last few days and it's been a vast improvement in my scores... It's not exactly made me good but I'm confident the issue is no longer my set up