Torsos that should be thrown away forever: Piraka and Kongu(Piraka looks aweful whichever way it's attached, and Kongu Torso is short and looks blocky on sets).
The inika torso is decent, and can connect in many ways, but it's so skinny. If they could add bulk to it while not leaving gaping sideways holes(Gresh, we're looking at you) it would be great.
And yes on the Krika armour recolours, but not to use it like MN or Onua, who make it look goofy. It's not big enough to be chest armour like that, and it fits better on Makuta Torsos IMO.
Piraka: the proportions SUCK. it looks best in a non-metalic color, with matching hips and neck piece.
kongu: never seen it, so no comment.
inika: personally my fav torso. and there's a really easy fix: remember those technic beams, just sticks of o-holes? there's a 2-hole one of those (yes, just 2-long) in a lot of sets. put that in.

ad i think makuta torsos look best like krika.
we don't have any piraka or makuta torsos this year because the glatorian neck can't really attach to them, without getting the deadly infectious disease known as
Strakk-Neck-Syndrome.