I don't understand whole confusion / dislike towards Shaman. Od course he is very specific type of Eddie, but he isn't bad. He is very all around really. Slightly tanky with 20k hp (including talismans ofc), some decent damage mostly coming from his past AoE attack and burns, and also cheap healing skill makes him really high tier Eddie in my eyes. I'm not going to mention all of those marks you can apply on his fury. He just needs specific team really. I found him being usefull with bomber boys (for those sweet burn stacks) and thief talisman gunners to keep those marks running like it's 90's (hope someone get that joke).
As for my build I use 2 burning Talismans (fierce and safeguard), 2 holy (Power and arcane) and 2 health overwhelming especially to boost Conjured Flame and its stacks. Of course there might be better build than mine, but I wanted to make use of his blue, green and red slot to get some sets' benefits.