No, these people don't really get into it. It's not really supposed to be another kill-everyone game. You can make just about everything from catapults to homing missiles to vehicles to bases - and more. I really do suggest you get a few add-ons from their site,
here.
- Wiremod (takes some time to get used to, but DEFINETELY worth it)
- Dismemberment Mod (Lets you blast limbs off of killed NPC's, also, they smash when they hit walls/floors too hard, etc. Extremely bloody.)
- The most recent version of PHX (A bunch of great construction props)
Downloading add-ons is more complicated than Blockland, though. You have to save it to:
C:\Program Files (x86 for Vista)\Steam\steamapps\[username]\Garrysmod\Garrysmod\addons
Then extract the files there. You have to download Winrar (I do believe) to extract them. You'll get used to it, though. ;P
Hope this helps!