Look around. I've praised parts of the game too. In any case, if people don't feedback on their concerns, then how exactly are the developers expected to know what we want, what works, what doesn't, what's liked, and what isn't?
I'll agree that constant whining and claims of "I'm not buying the game now" are childish - if someone doesn't want to buy the game great, they needn't rage quit about it, just don't buy it, but I fundamentally believe that concerns should be spoken about. Changes can't be made to games (changes which do happen) unless the community first speaks up. Having read other threads, it certainly does seem as though Frontier have listened to feedback, and so feedback (not to be mistaken for whining) is justified. You're never going to silence opinions, and quite frankly, you shouldn't anyway - without them, there is no change.
Aside from what you've already mentioned, there must be other features, items (etc) that you'd like to see for this game in the future. If you don't speak up about them, how are the developers expected to know? It is a shame about the blood too, though I guess that one is on Universal. Shame Frontier couldn't just change the colour to purple and name it 'splash damage' or something...