1. Most the time, the word "negative" implies that optimism and pessimism are both equally reasonable, yet the negative option is being chosen. As if it is some sort of personality trait. Or flaw.
2. Other times, "negative" can simply indicate the leaning of a judgment or projection based on analysis of the evidence.
I personally tend more toward the first as do many other people, even though I know it's an emotional judgment on my part and not a rational judgment. In the offseason I prefer to read positive commentary and avoid negative, in general, because I just want to enjoy how the team is growing. However, during the season I tend more toward negative commentary, because it can tell me what on earth is going wrong and why my positive feels were so off-base in the offseason!
However, the 2nd definition tends to carry more weight with me because, obviously, it's based on facts and evidence. They're still projections on both sides, but #2 tends to ignore one's own personal preferences. That's why I come to this board
I would also label your assessment of Fisher "negative", but in the #2 category.