Ok, here is the reasons: 1st one: Just a copple effect you have mixed together and looks fraking strange, 4/10 The other one, plain, dull colours and the brushing is over the rnder >_< 4/10 Satisfied? That was Ecks sigs.
Ever considered that other people's styles may differ from yours, and you should take that into account when you rate? Your sig is just a render pasted on a motion blurred bg and some circles all over the place not here to start a flame war tho... too tired for that <_< EDIT: 6.5/10 for both. kinda monochrome, the blue and orange one is decent, but the pattern sort of messes up.
1st-it would look great without the render 9/10 2nd-i dont like smudge but this looks nice 9/10 3rd-not much done and same for the 4th one 7/10