And I'll share some of my experience on the matter:
For the last year I've been playing FEC against many different opponents and beat a lot of them. I've beat Skaven WLC-Acolites-Verminlord list, Anvilstrike list (but not proper one, my opponent has been using ballista drop alongside 9 longstrikes), 2 games at pair tournament against shooting skaven lists paired with melee forces, 2 games against BCR 3 thundertusks lists, 3 games against semi-shooting Seraphon summoning lists. And I've lost to shooting against ballista drop with old FEC battletome and against old Cunning Rukk.