Lmao oh god, NS.
If you seriously dont understand why they're facepalming i really pity you xD ...
In my opinion its not the greatest sig, Seems like focal smudging/liquify'ing perhaps, and then blurring, you should try some other techniques sometimes ^^ (check out some tut's, you dont actualy have to copy them, but you can try applying the techniques used in them on your own sigs, in your own way).
I dont think its a bad sig either though ^^ i think its how most people start out, because it can create pretty flashy looking effects kind of easely.
Im an amateur myself aswell though

and good choice of text and effects are pretty difficult, so keep it at simple fonts if possible, for now ^^
(at NS, you should really try giving constructive reply's sometimes, instead of just bashing sigs into the ground, its not like you perfected sig making yourself ^^)