Nu metal is a style I don't like all that much.. and that's pretty much what this is. There are however some melodic guitar lines heard that are great, but aren't used to their full potential.
1) The reggae parts sound terribly awkward, come out of nowhere and stop for no reason, really pulls the songs down. And the nu metal in the song doesn't do much good either.
2) This one sounds pretty good, but the down-tuning takes much of the power away.. really, it isn't necessary and, to me, doesn't sound good.
3) The start is actually pretty cool, although too groove orientated for my taste. But then it's quickly replaced by a nu metal part, which also stops for no reason and the cool guitar melody comes again.. but now it's just tiring.
So, what you need to do in my opinion : Develop your writing skills better, so the songs don't sound like you made a few riffs, placed them in a random order and replayed it. Then, lower the nu metal influence. It has always sounded really juvenile to me, instead of tough or "metal."