Hi there 
  
I was a bit surprised by this topic (now i don't consider myself a power gamer by any means) 
but i made a multi class soulblade/bleakwalker bit of a one trick pony perhaps but i find 
it very effective and fun to play. 
  
And ok i ignore all spells except body attunement. 
  
Well wat can is say i don't think this multiclass is weak in any way 
  
(please note this is only my opnion)