So here is my experience playing other classes in solo on tier 8 delves. Mind you my non-mage alts were much lower ilvl than my mage/guardian druid.
- Mage is actually mid-tier. With cooldowns stuff went down fast with little damage to my mage. Survivability tricky but doable when CDs off cooldown.
- Guardian druid was easy, but slow due to low dps.
- Enhancement shaman was more difficult than mage, but with Braan as healer was on par.
- Resto shaman was a disaster.
- Affliction warlock was probably the easiest.
BTW, I switched Braan to a healer on my mage now that my ilvl is higher and its makes things really easy now.
Anyhow, my skill level on each on my alts varies greatly. What are your experiences playing other classes on tier 8 delves?