Skeletal mages block ranged attacks. Only real problem are mobs that jump on ur head or ghosts that come and channel dmg to u.
Season 11 Necromancer vids: https://www.youtube.com/c/RavennWo
Singularity isnt paper <.< Only played it since S11 (really dont like trag) and works very nice. Recorded this today on a 96 if u wanna give it a look:
And yes, to answer OP question, its doing ok, enough of them in EU leaderboards. You also have a 3s vid in there of a 97, Sing nukes elites and RG like there's no tomorrow xD