I think this list should really be split out into two lists: Caster level 1-4, and caster level 5+. The list of spells you want in the 1-4 range, and the list of spells you want at the 5+ range, have very little overlap. (Shield, for example, is an amazing spell at higher levels, but how often do you want it when it costs 1/3 of your daily spell slots?)Sleep is D tier?
Wut?
But if they must be merged into a single list... yeah, I agree, "Wut?" is an appropriate response. Sleep is a niche spell but absolutely dominates that niche. There is no way it deserves to sit in the same tier as witch bolt.