Agree, personally I am more wary of uprampers - seen it so many times where at one moment, they are upramping the stock - then the next (after they have dumped their shares), they are down-ramping it.
You just don't know whatever they said is true or not.
On the other hand, for the consistent down-rampers, I found they have done more research and present a more meaningful argument about the merits of the company.
Overall, I have found most of the consistent down-rampers have more credibility.