MU was bad for Roy before he officially came out/Ivy nerfs. I have no idea what it's like now. Bair is ok to deal with, the real issue was Leaf. You can deal with Bair on the ground with shielding as you run in, or CC, or outspacing it with a DD while moving back in. Leaf was a pain though because it usually lead to Roy jumping, where he lost the ability to better deal with other Ivy moves. Clanking and other choices were not good enough to press for an advantage against the move. You also locked Roy down in an awkward position if you did SH Leaf, or delayed leafs as you fell. Clanking or avoiding those without jumping over was not easy or worthwhile usually.