Well.... in the end every tip here is valid; nade spamming, claywhoring and reviving like crazy will all get you points. HOWEVER, if you want to really enjoy it, and not become the number 1 hate figure of your favourite server, don't do these things. In fact, the people that whore are your TARGETS:
1) Nade spammers- Will all group together, in very predictable positions. One example is the low roof to the east of the hotel flag. There will almost always be a squad of USMC there nading the hell out of the spawn point. Answer? Spawn at square, keep in the shadows, sneaking up behind them. One nade on that roof will most likely wipe them out. Points for you, the possiblity of actually spawning and surviving for your team, and a bit of karma for the nade spammers.
2) Claywhores- If they know you see them, they will run at you and try and drop Claymores at your feet. So simply fire your nice Ak/m16 in their face while backing away. Then, importantly, wait back for one of your team to run along blindly in to the Claymore. = A kill and a revive, easy.
3) Paddle Pirates- Easy practice for you and your assault rifle. If they bunny hop (as they will) aim for the biggest and easiest hit area, the chest. As they don't have their gun out, it doesn't matter how many bullet you take, as long as you kill them.
Each of these will net you a load of points.
Also, follow thse simple rules...
- Stay OUT of the most densely populated areas, such as directly next to Hotel spawn points. If you stand in these areas, you will get naded within milliseconds. All you need to do is stand to one side, wait for enemies to run in to these areas, come up behind them and nail them. Try and use paddles, makes it more fun. This may sound simple but if you think about Karkand's layout you will see how easy it is to sneak behind people, especially if they are busy with their nades.
- AIM FOR THE HEAD. I can't stress this enough... I never used to do this, but trust me, on karkand IT WORKS. You may think your bullet will just go flying past their ears, but they just won't. Karkand is so tightly packed that most enemies will be within metres of you. If you practice, aiming at the head is deadly.
-Don't get pissed off. This is one that i actually find hard to follow... every few games you will start terribly, getting killed instantly by a grenade, or a spawn raper's LMG. Just forget it and play on.
Hope this helps.