I've never been a fan of Irelia because I never understood her playstyle. I'm pretty sure I still don't, because I think she's just so versatile she does whatever you want. No wonder Wickd likes her lol.
Regardless, Irelia is better than MF by a mile. Honestly, with the release of Draven, I'm pretty sure there is no reason to pick MF. Graves has better AoE, Draven has a better early-game all-in, Trist has a heal debuff and is actually good late game. MF is fun, but Irelia is probably the most versatile bruiser in the game. There is a reason everyone plays Irelia and she's often permabanned against CLG.EU