1st Bot: I like the disc, despite the fact it's pointing the wrong way. Wedges less so, they look to me as if they'll get in the way a bit, and a little bit flimsy. Perhaps try smaller wheels, such as Vlads or Tornados, and see if you can improve the front wedges with the weight saved from that.
2nd Bot: I think it looks cute. Like a baby version of those Tombstone-like HS you see. Beaters keep the front up, but they're a little bit ungainly, and I reckon the back wedge is a little too steep. If you had the skirt hinge in the middle, it'd be the same both ways up, and at a shallower angle.
3rd Bot: Interesting way of doing the weapon. Flipper Segments look a little bit suspect to me, though. Wheels do go well with it, though, good call on those. Aside from that, I just think it looks a little bit basic. A slightly flashier skin would give it a bit more of a pop, rather than a simple mix of greys.
4th Bot: Taz wedges go really well with the angled shell. Stuff on top seems to work well too. Although I can't help feeling that it looks like a turret hammer bot without the turret hammer. If you could find a way to squeeze a turret hammer on there, that would look fantastic.
