Ship itself isn't an issue. And Guri & Xizor are both excellently defensive ships who can have that emphasised even further if you want.
Problem is, they're still a 3-die gun, and the generics cost 5 points more than a Kithraxz for all of 1 more agility, while the aces are better value yet easily creep towards costing 40 points. That's just a little too much, for not quite enough dakka nor acewing (ie PS and repositioning actions) to make 'em worthwhile. I'm honestly not sure how to fix them, but I hope it's with a firepower enhancement, so their price and toughness becomes justified. And Xizor's ability becomes valued, simply for keeping the omg-kill-it-now ship alive that much longer.
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This. Once you considering equipping something useful on Guri or Xizor it really gets too expensive, starting already at quite high costs.
A glittering Khiraxz packs a lot punch, too, and does'nt hurt that much pointwise if it is killed.