No.
Again, subjective.
There were some instances when the some members were given negative trust and the users were not actually spammers but the DT member felt that they deserved a negative trust as the posts were not on-topic according to the DT member.
The only two members that stand out (from my analysis/questionnaire), and were against this, were Quickseller (scammer/account trader) and Shorena (DT2, escrow (does account escrows as well)). I'll let you speculate as to why they were against this.
The ratings were changed later. We already have a SMAS list and plus spammers get banned, hence that's more than enough to deal with spammers.
It's nowhere near enough.