Especially when Phil Kelly is worse than Matt Ward. With the exception of DE, every Phil Kelly codex has turned into either an OP cheesefest monobuild, or an outdated monobuild. He loves writing books where one particular unit is obviously significantly better than everything else in that FOC slot (Wave Serpents, Warp Spiders, and War Walkers with 6th Eldar, or Harlequins and Falcons back in 4th, Nob Bikerz and Battlewagons for Orks), or sometimes even in the whole codex (Heldrakes, Long Fangs). And even with Dark Eldar, Venom/Ravager spam is still the norm, with the occasional Beastmaster or Hellion unit thrown in the mix.
Really, none of the writers are actually particularly good at making balanced rules. But Mat Ward is definitely not the worst.