A decision like that is a very personal one and entirely up to you. I can understand that you have found a situation in which green is no longer appropriate, but you do not say what. Why do you feel as you do?
More importantly, - have you contacted the seller? Often little obstacles can be sorted out between 2 people, to the benefit of both. Most sellers will try to avoid negs and neutrals, so give the seller every possible opportunity to make you happy.
At the same time keep in mind that feedback you leave for others you also leave for yourself. It will always say more about you than it will about the recipient. If, say, you ordered something from China and the quality is cheap, - is it worth leaving a neutral for an axiom like that?
Or maybe the seller sells items that are of a nonfunctioning poor quality and when contacted about the problem, is utterly indifferent to your needs - and your money. That's a good time to leave a polite and carefully worded line of information for other buyers to see. You pick the colour to go with it.
There are times when the seller leaves you no choice, - there really are some horrible ones out there. But if the seller is genuinely good only you just can't justify leaving a green, then leave none at all. That way your conscience is clear, - you can't bring yourself to do him some good, but you don't want to do him any harm either.
And always be honest in DSRs. If the item came super quick & cheap, those are 5s whether you like the item or not. If the seller was kind and understanding but the item is really poor, that's 5 for communication, but 'as described', well, you'll have to do what you think is right. Same as if you love the item but the seller was really rude to your questions, - annoying as that is, don't take it out on his shipping DSR.
Either way, you have 60 days to leave feedback, so I'd say give it some though, - but first contact the seller. I wish you luck with your decision. 🙂
