• I'd like to at least get some feedback when I vote, now my vote seems to just disappear into a black hole. Perhaps make the arrow orange after I click it (or simply a tick, ✔ voted)?
• It feels pointless to upvote the only comment in a thread, it doesn't affect anything unless more comments are posted (again, lack of feedback).
• I often can't tell if a comment is any good (e.g. an answer to a scientific question), points really helped here.
To reinforce your point, I just tried to upvote you in response to the scientific answers point, but I may have accidentally clicked downvote instead. I'm really not sure.
• It feels pointless to upvote the only comment in a thread, it doesn't affect anything unless more comments are posted (again, lack of feedback).
• I often can't tell if a comment is any good (e.g. an answer to a scientific question), points really helped here.