First of all, NON LETHAL MASTER RACE.
ok now that i got that out of me.

So. your here because your either:
A: A Lethal Gun Noob, who keeps losing. or
B: You felt like reading something stupid/silly.

Im explaining here how going full LETHAL mode on everything is bad.
(this is mainly a Bounty Hunter Perspective) (im ranked in the 1000's so i KNOW what im talking about.)

you might be thinking "Maddyo! why are you trying to change my playstyle! i like losing constantly!"
if not then you proberly have more then 1 braincell in your head total.

Lethal is extremely bad, because of the fatal flaw of when you get fultoned, ALL YOUR KILLS ARE UNDONE. yes. ALL of them.
your proberly thinking why this is. ill tell you.
When you get a kill, you get +1 bounty on you.
When you get fultoned by an enemy. all that bounty is transferred to ticket count.
So it is ok to get the occasional kill. but when you get fultoned with say... 15 bounty points.
your really shooting yourself in the foot.
before you ask. yes, if you get fultoned with 0 kills they will still get 1 ticket added to their count.

Yes, Kills may be easier. but thats the problem. its just as easy to fulton someone.
take the infiltrator for instance. he can go invisable (not much of a problem since its ez to see)
he can place Fulton Cannons (Lvl 17 unlock), and can also fulton PUNCH you. (lvl 20 unlock)

in short. dont get too many kills. or people will run and punch you in the face just to get them back.

I will help you here to do as cranky says. Gitting Gud.
Heres a few tips and tricks ive learned to be a good non-lethal man.

• Spam the ♥♥♥♥ out of your chosen trap/nade (Plushie, Magazine, Fulton Cannons, Etc.)
  
• Slamjam people then Wu.s Pistol their face off. you get about 1.5 seconds to get that headshot before he can shoot you back so make it count.
  
• Go for Headshots, ALL the time. a headshot with a Wu.s Pistol is a INSTANT Sleep. (not to mention a good XP bonus)
  
• Dont engage CQC gangbangs unless you have CQCLVL2 or FultonLVL3. you will always lose.
  
• Shoot Red Balloons. They are ENEMY Fultons and your 1 shot could help bring it down to avoid giving them tons of tickets.
  
• Box and Decoys can get rid of markings. making it so people will only know where the box or decoy is.
  
• You have teammates, dont think you can go rambo and win. because 95% of the time it WONT work.
  
• Its better to die then to be fultoned. suicide if need be.
  
• Till the new update where Wormholes comes into the equation, stay indoors. you cant be fultoned there.
  
• If you see an Enemy on the floor, with stars or ZZZ's above his/her head. Dont kill them. fulton them instead and get more XP and tickets back.
  
• You get 200 Points Per bounty point you fulton. it also counts towards team score at the end (if ends in tie) kills count for 100 + 50 headshot Points, shows that going the extra mile helps in the long run.
  
• For a non-upgraded fulton it takes 2 Wu.s Shots to bring it down. for the durable upgraded version its about 2-4 Stun Shotgun blasts. depending on spread of course,

I hope these tips will help you lethal noobs become better non-lethal players.