but what happens when a DT member goes out of his way and tag someone for saying "lemon"? what if no other DT member give a counter tag to the lemon tag?
In these cases, the affected user opens a thread, and there is usually a lengthy discussion that either results in:
1 - removal of the red tag
2 - addition of more red tags
3 - countering of the red tag with a positive tag
If a DT member is found to be constantly leaving inappropriate feedback
which the rest of the community disagree with, then they will likely be removed from DT before long. In cases like Anduck's and mdayonliner's, don't be fooled in to thinking that they are victims of some "rogue" DT member. Given their continued vocality the majority of DT members are well aware of their situations and have actively chosen to either reinforce the red tag or to not counter it.
theymos also agrees that the DT system is not perfect (
https://bitcointalk.org/index.php?topic=5080581.msg48500915#msg48500915), and he is very interested in any ways to improve it. In the short term, I think there is a very strong argument to be made for a handful more DT1 members, and by extension many more DT2 members, to keep things as decentralized as possible.
Can we please not derail yet another thread in to Anduck's mdayonliner's personal beef.