I thought GMod came with all the HL2 stuff.
Only the first one, none of the other Half Life 2s, that includes Deathmatch too
I can't just download the files from the addons when I join like in Blockland?
There's a download option in the Multiplayer tab of the Options menu, but that's set to 'Allow all custom files from the server' by default, i don't think it can download stuff that's from the workshop, only if they're non-workshop stuff i guess