Title says it all really. I'm sure this isn't an original idea, but I think it would be beneficial to have a mandatory character minimum for people negative voting on deals. It would stop the unexplained, 'me too' votes that tend to occur frequently here. Reasonable comments accompanying neg votes are far more beneficial to discussion.
Negs that aren't conducive to discussion are often impossible to remove via comment negging, since it usually conforms with the general atmosphere of the thread (read: bandwagon). As a side note: I've never understood why people feel the need to continue negging a deal - aren't the first couple enough? Usually the first couple of negs will be accompanied by reasonable comments… then everything after this is mainly just 'Lol, neg' and 'Agree with the above, neg'. The whole thing may be predicated by the perception that more negs = lesser quality deal (which, thanks to the neg-sheep, is not necessarily true), and the need to assert one's opinion / feel 'popular' by conforming. shrug
Also: not only would it aid in improving discussion, but it would make moderating a bit easier; mods would no longer have to trawl through long threads to revoke undeserving negs (well, perhaps they still would, but less so).
Obviously there would be a couple of ways around this, but I'm really thinking out loud here… IMO anything of this variety would be better than nothing.
It's an interesting suggestion and I don't believe it's suggested before.
Many of the invalid negative votes are 1 word votes.
Off the top of my head, some possible issues.
Firstly, say a member writes a comment and either waits a bit to negative vote or another user responds to the comment. The user can no longer can change their comment. So a user would be permanently restricted from negative voting.
Second, my guess if the minimum character limit is 10, then say instead of crap, they could write crap crap crap.