Use good movement to exploit your foes weaker defensive angles & attack those spots.
Unlike anyother fighting game, kof requires art in all areas, kof has high skill levels even in walking, running, run then attack, jumps, hops, basic moves, back dashing, all these are some things you can do in most fighters, but kof has a degree of skill even for doing these.
Some moves in kof seem slow, they are slow if your enemy reads your style well.
Every character has different tap combos & combos. If you think you can do weak combos for every character, then your wrong, they require skill & the human brain can't hold all the different set timing required for each character, thats why people often pick the same team & characters.
The point is, kof requires lots of dedication before you see results, to be honest, lets say sf does not need that much mind space, thats why you can learn every character to a decent level no sweat, timing on the moves are similure from character to character.
Once you learn stuff in the kof series, it starts to get hectic for our minds to handle, so we play certain kof games to keep or gain new skills from, no one can play 2 or more different kof games & carry there maximum skill with all characters over to the next game as it would have changed so much that your brain can only hold so much percific data.