Okay, so color flow doesn't matter as long as it's simple? Go paint your wall the color orange, give it random paint spots of red, black, white and whatever else color you want and tell me if the room has a nice feel to it?
I'm not sure if I quite understand what you mean by this color flow. If you look at Silent's Mario sig, it has a rather light colored picture of Mario on a light yellowish brown background. There are no random spot's of a different, darker color, therefore it seems to flow pretty nicely together to me.
Then again, if you look at your own sig based on the same render, it has a little darker picture of Mario on a dark background with some strange detailed stuff on the left, sorry I can't figure out what it is exactly. You also have some reddish glow-thingy in the middle, behind the text, and also some similar but white glow on the left edge. When I look at this sig as a whole, the Mario and the lighter glowing parts stick out too much compared to the background, there's too much contrast between them. Therefore it doesn't flow in together so nicely.
If there is nothing good in a sig then why give it any positive rating?
In my opinion there's a lot of potential in the signature in question. As I stated before the colors indeed flow in together pretty nicely, and with some more work these colors could make a pretty good sig. Maybe you missed all the good stuff in the sig because you were so busy finding flaws in it. For example you stated that 'the colors are pretty bad', without giving any reason why they are so bad. If you were talking about the color flow you should've sayed it more clearly, because now it gives me the feeling that the choice of colors in general is totally wrong. Like Silent shouldn't have used the yellowish brown color on the background? Why? Because you don't like the color? To me the choice of colors seems to be pretty much a matter of individual taste and in this case it even has some potential.
I am also no professional as you say
Indeed, that's why I typed it in the form 'professional'. I don't mean it as a personal insult, I'm sure you know how to make signatures and other artistic stuff and put a lot of effort in them and so on. That part was in reference to Syphon's post which said that his sig is 'much more detailed and professional'. I personally think that the amount of details only gives your signatures an overly fancy look, which may seem professional to some but it doesn't convince me that they are much better than the simpler ones, like those by Silent in this very thread.