It seems that Fyreslayers are the best warband for sitting on objectives, which was previously the niche that Stormcast filled. If you build a deck with lots of pushing and objective swapping, and keep enemies out of your face for the first turn, then you can do very well. I don't think I've enjoyed this game more than when Fjul charged 6 spaces past 2 bodyguards and killed Spiteclaw in a single strike.
Ironjawz seem to be the easiest matchup. You can comfortably sit back on objectives for one turn then pound them in combat.
Skaven have been the toughest matchup for this style of Fyreslayers, since it's very hard to be out of range of turn 1 charges. Daemonic Weapon and Heroslayer attached to a suicide rat are risky gambits, but they can basically end the game if they work. If you push them out of range you also inspire them for free.