The biggest issue by far is that they aren't battleline so you need normal units first, and when you do that you start to see the issue becoming apparent that shartorr lead bull renders are easier to build synergy with when both are already included as your core. Add some guns and some blocks for objective holding and you start running low on points. They are great, especially as a second wave behind the bulls, but having them as an extra choice can make them an awkward inclusion at times