@Beret: The Blues know how to build walls best. O v O d

As for types of walls, I don't give much of a damn. I move too often from cover to cover.

@Beret
You are perfectly safe with that wall IF you don't get attacked my mongolians!

A good wall/position should be if possible, in a higher place, giving a height advantage over the enemy.
Resort to medieval tactics:
Murder holes: Overhangs that overhang the wall with small holes in the ground to shoot any enemies along the wall.

Keeps:A small courtyard that enemies will be channelled into and slaughtered

Ramparts:Sort of like the great wall of China, a block placed every two blocks from each other, offers side protection.

WatchTowers: towers with small bases and a overhangine top with murderholes and such. (easy to grief)

Pits: Pits that the enemy would fall into for farming, possible a deep trench or a trench that it near impossible to get out of. Best effect behind a 1 block or 2 block high wall. Or even infront so enemies can get to you.

i do this with a friend
http://s1206.photobucket.com/albums/bb450/Secondpl/?action=view&current=tactic.jpg

I hate it when you have to stand behind cover.

You should crouch everytime you shoot. Decreases cone rapidly.

World's best defensive formation:

http://i.imgur.com/eDpEP.png

Make one, wait for enemies, pop up, kill them all, make another elsewhere. It's completely undetectable, requires no blocks to produce, and you can build it in 3 seconds. It's also very flexible; it can be built on any terrain, and you can easily add stuff like side cover and escape tunnels as needed. It's so effective that nearly every modern military makes use of it (or a variant thereof).

A good wall does a few things

-lets you pop up in surprising places
-shields you from directions you're not looking
-provides cover if you want to run away like a coward-infant

Something like the 1x1x2 hole in the ground can be shot at from any direction and lets the enemy predict exactly where you're gonna show your head.

@KomradeTyler: yeah murder holes are awesome

I have another design that works well for providing opportunities for SMG-users to crouch while firing over the wall, through use of crenellations:
http://filesmelt.com/dl/Wall.png

The advantage here is that riflemen can use the wall through the normal stand-to-shoot, crouch-to-cover method, while the submachine gunners can cover by crouching (crouching reduces SMG recoil, for those of you who don't know) and moving back and forth in and out of cover.

The obvious problem with this wall is that it takes longer to make than other designs. It could be built with a single-thick wall and single-spaced crenellations, but with the destructive capacity of the SMG single-thick walls aren't the greatest cover. Make the wall double-thick (with double-spaced crenellations to avoid reducing visibility) if you expect to use it a lot.

I started building a "B" wall on a server and a bunch on my team mates started to help. We ended up building this really cool double b wall as I call, it take a look it's like an upgraded b wall.

http://filesmelt.com/dl/Double_B_wall.png

people join server spec_ops vs. all

I'm not playing right now

Double-Bs are okay, what you really want is a Double-D wall. (so hot)

Edit: oh yeah I remember your post :D

You also need to add an exit so that you can move forward easily without taking fall damage. I really like these sorts of threads!

You won't take fall damage from a four-block drop.

@megadeuce Lmao, btw how do you make a link with custom text like that?

@ Pink & outwrangle There is an exit in that small area with the stairs

<a href="link goes here">Text goes here</a>

:D