/facepalm. I'm aware of plenty of good Mitsurugi players. I never said he was a poor character, merely that he wasn't this monster you seemed to imagine in your mind.
Most of his verticals that hit grounded do little damage, and push you out of range for any kind of wake. That's not to say that his wakeup game is garbage, but it's not that scary.
The one out of a stance is easily interrupted, and the two inside of his stances aren't scary either. One is incredibly slow and strikes low twice, allowing you to either jump and punish or simply interrupt. The other is a tad bit quicker, but can be stepped, and only has severe implications if you start eating the cancel into a high GB.
Here's your problem: most of this board will be talking about offline, unless you're specifically in a thread talking about online only, or in the SC Online forum subset. Online can be fun, but it was not designed with lag in mind, and can completely change the way the game balances itself (for the worse). Hell, online in decent lag I can 1A spam with half the cast list and win. That's why it's not really pertinent to these conversations.