heres how to spectate a server that is full with just a console command

1) Find the server you want to join.
2) Get it's IP address. Example: 123.456.789.123:7777
3) Hit your tilde key (`). This should bring up your console.
4) Type code:

open ut2004://serverip:serverport?ServerSpectator=1

credits: [DD]

I honestly thought this worked when I found it. Turns out it was just dumb luck that someone left when I joined -_-;

lol,  it doesn't work? never had to use it, just saved it on my computer for future reference.

lol
this one's nice 

Try this one:
open ut2004://66.150.221.234:7777?character=.

All that will do is crash the server, and if any server has the 'Flag/Clone fix' running, it'll say you are banned from the server.