now i read your post i don't only see disadvantages about the Wizzard Slayer.
The thing with them is:
no magic items!
Ok u can get the great weapons and Armor but : NO
Boots of Speed NO
Cloak of Mirroring NO
Cloak of the Sewers NO
Ring of Gaxx NO
Ring of Prot +2 NO
Ring of Human Influense NO
Ring of Invisibility NO
Ring of Free Action NO
Ring of Earth Control (ok that where the rings
Griddle of Strenght ** (no need for themwhen u get the Crom but it is a long time before Crom gets there) NO
Griddle of Infurnal Barrier NO
Healing Potions (very importend in the early game) NO
Potion of Speed (very importend in the early game) NO
Potion of Invisibility (very good in the early game NO
Potion of Strenght ** (no griddle, no potion: only Crom to make u better)
There re a lot more things u miss when playing Wizzard Slayer but these thing would i defenatly miss the most.
And don't say he is bad, when i want a challenge i will defenatly play a solo wizzard slayer because there are some advantages (i just read them in your post