Speedblitz is Cullens primary advantage and you took that away. Without blitz, Cyclops might solo. I don't think Cullens have any answer for lightning blasts from an airborne Storm or any way to harm Colossus or Shadowcat. Wolverine also has the capacity to kill some Cullens if they can't blitz. Angel, Beast, and Iceman (at the power level he displayed in the movies) are fodder here.