It's really all about spacing and picking your pokes well. Knowing when to apply pressure and when to back off.
I just went on a two hour undefeated streak on For Glory with Mac. I LOVE this character.
Here are two of the matches I uploaded:
This first one is against a sonic player. Being able to read your opponent and bait him properly can help you set up the KO punch. Because the KO punch goes through shield you can confirm with dtilt and let it rip.
http://youtu.be/Z-dc5jPHlyk
http://youtu.be/_d7Tg5uu8Fo