The brightness of colors is a subjective matter. Many people use a very low contrast/saturation setting for their monitors. I have a very high contrast setting, meaning dark colors are brighter to me than to some others. It might be that it is just not enough contrast on your settings for good reading. A window in the room affects that as well. Meanwhile, using frequently changing strong colors like you do in your posts (the KSP posts are clearly better than the LPI eyecancer) is likely to annoy people.
If you want to criticize people's work, you might better use their respective RP feedback threads for that instead of feeling funny by calling them out in flood threads. The last thing I wanted to read today, after getting myself to get into the forum again and do some RP with friends after being done with this game, is some nobody voicing feedback like a vegan who can't shut up about being vegan.