Most mirrors are boring tbh. Either they're too fast paced or too slow paced.
The only matchup in the game that ISN'T a mirror and is still BORING AS FUCK is FANG vs Guile.
It's good but not THAT strong. One of the only two characters in the game with a throw invincible EX command grab. I love it.
Mika mirrors are pure chaos. I lose them nearly all the time because I've played against like 8 out of like 1800 matches.
His bull rush and command throws always surprise me with how much damage they do, it's ridiculous.