I'm going to be a contrarian...at least a little bit.
First, feedback is limited to 80 characters including spaces, so you must use shorthand and can't be terribly specific.
>But do not please post effusive praise for
>normal service because if you do, the currency of feedback is devalued.
I've got to disagree. I think "normal service" is exactly what most eBayers want and expect. For buyers, that means receiving the item(s) promptly properly packed and in the condition described in the auction text and shown in the photos. It also means not using shipping and handling as a separate profit center.
For sellers that means being paid promptly according to their instructions. For both, it means communication as required to execute the transaction.
Meeting these conditions deserves positive feedback. If calling someone who carries out an effortless transaction with you and leaves you satisfied a "great eBayer" or "A+++" is effusive, I've no problem with that. it tells me I'm going to get exactly what I'm looking for.
You've only three choices and positive in that context has to mean
meeting minimum standards (as outlined above). Neutral is like a blind
date that, while it didn't scar you for life, it didn't meet your
"expectations" either. And negative is reserved for...
> the morons who cut all the adverts out of old magazines and sell them
>one by one (and their kith and kin). ;-)