General CTF ideas.

[Dreadlife]

It breaks down really simply...

Defense is a game of read and react. Recon is essential as it tells you where the attack is likely to come from and gives you a chance to set up accordingly. Sniper rifles are great for defense, as are close quarters weapons like shottys and swords.

Rocket defense can also be very nice, but be sure to conserve ammo and only use the heavy artillery when necessary. Many times and offense will just throw people at you until you are out of rounds, then come in for the easy score. Don't give them that opportunity.

Think outside the box. While it is nice to keep someone right near the flag, many times the best defense points are just outside your base. This allows you to either cut off access points and not let them anywhere near the flag of let them in and then close the net around them and not allow escape.

Offense is a little bit trickier. Offense is more about planning, coordination, and most importantly, timing. The defense will generally shift according to what you do, so use that to your advantage. You can do things like send two men in, wait for the D to engage, then send two more to finish off the weakened defenders.

Other nice moves are pinches, sending men in at the same time from numerous entrances making it hard for the D to bring fire to bear on any one target and feints. Feints constitue sending a decoy in to make a lot of noise on one side, pulling the D there and then attacking in force from the back side.

Weapon allocation isn't as important to the O, what is more important is that you win the one on one fights. If you can't take down your man, the team is severly weakened and exposed.

[xattax]

No one thinks Defence is exciting cause your just sitting at the base. But if there was no defence you'd lose quickly.

[furiont]

Yeah, defense to some is not as "fun", but it is integral. I can think of plenty of games where I had teammates running around like fools trying to get into some fights. Sometimes, and by sometimes i mean very few, you may want to catch them off guard by a defensive attack.
In my opinion, the best defense is the type where offense is unknowing of the locations of the defenders. You obviously want to have a sniper most times. If for some reason the offense has a sniper and you do not, do not even worry about the sniper. Most likely their sniper will not steal the flag or arm a bomb. Just take the sniper out of the game by disallowing the sniper to get you. If they do attack, you'll have a numbers advantage. But of course, there are always exceptions to the rule.
I really like to use grenades as defense. We all know grenades work directly dealing with a bomb-armer or a flag stealer, but there are other ways to use grenades as well. Throwing grenades at entrances can possibly lure attackers to a different entrance. Sometimes its effective to throw grenades to "expose" your position. Attackers may try to take you out instead of aiming directly for thier task, therefore giving your teammates the kills. But the best way to use this tactic is to "expose" your position, then move to a location where you will have a good shot of your location. That way, when they come to find you (only to see you arent there) you can shoot them down.
There are unlimited ways to make defense effective. Last thing I'd like to say is ALWAYS ALWAYS communicate to each other.

[Dreadlife]

And that, ladies and gentlemen, is why Furiont is the man.

[xattax]

Amen