Agreed, I think Saurus of all stripes should be rebalanced to be the quality troops that they are, rather than just reworking their points cost. Skinks have always been horde troops historically, while Saurus should be the quality units, which currently they are not - they are just other horde troops, ones that can actually fight but not that well. I can certainly think of some things to improve from the offset:
Make bite attacks better - even hitting and wounding on 4s is better, and is actually decent. Hitting on 5s is just bad.
Change the ability of Stardrake shields to reduce the rend of all attacks by 1, like the Coalheart Ancient Magmadroth can do, rather than just rend -1 attacks - many units out there have attacks with rend greater than -1.
Give Temple Guard 2 wounds as everyone else has said - Warriors can still have 1 wound, but Temple Guard are bigger, stronger and far older than Warriors, and should have an extra wound to represent this.
Just a few changes I've thought from the offset, but a lot more along these lines should be implemented if GW want to do a decent Seraphon battletome.
Also make Slann less of an auto-take, as the model is horrendously monopose and I don't want to have to take one just to make my army competent.