Newbie Forum - for decks that aren't all that great
Budget Forum - for mostly net decks altered for no workshops, P9, and sometimes duels
Open T1 Forum - for talking about netdecks or variations of netdecks, very rarely original decks though.
This is not at all correct. The newbie forum is for users that are new to type one/TMD/the internet. It's where posts get moved when they don't meet basic standards (eg just a decklist, with no explanation). There's plenty of good decks there.
The budget forum is for budget decks, whether that means altered netdecks, or something more innovative (eg "eggcademy").
The open T1 forum is for more advanced discussion, where people are expected to meet certain posting standards. There's plenty of rogue discussion there.