yes lions claw works fine.. maybe this will better help me explain it..

my lions claw is lvl 6 +1.. and what u do is.. u take the 17% and u times that by the 8 in ur base stats.. so its .17 x 8 = 1.36 there for u dont round up to get the 2%.. u get the 1% extra next to as u see the 8% +1% that comes out to 9% for like 20 seconds.. and no that is not enough to notice a difference in crit ratio akkarin its a waist of a skill anymore since epic 4.. but then again look at how powerful sorc were in e3 they really deserved the nerf they got and it wasnt that much of one.. it just takes time to find a way to play it efficently.. but if u want lions claw to be alittle more noticeable use an ancient weapon u might get a +2% out of lions claw but then again it would only be for like 20 seconds
p.s. its also kind of annoying to keep hearing about THIS skill being broken.. when imo it isnt.. its just nerfed ur to used to the old crit burn sorcs got in e3.. and dont get me wrong i know there are ALOT of bugged skills and stuff in this game..
oh.. and to stonky i see what you mean now.. yeah does not seem to work with evo 1 pets.. i just tested it on my evo 1 yeti and i need my aura of halisha activated to be able to gain that +1% crit ratio.. so in other words anything with a base of 6% and up u will get that +1% crit ratio.. if its anything under 6% as a base it will not get the +1%.. they do not round up from .5 it always rounds down it seems..