>>15632760
You have to adjust to a very different style of play.
2D games like Street Fighter reward skill, timing, precise combo execution and generally understanding the game you're playing and how your character works. Whereas 3D games like Soul Calibur and Tekken reward random button mashing.
If you play Soul Calibur expecting to be able to learn your character's special moves and win the fight by predicting your enemy's, you'll be disappointed as your character stands there and very slowly slashes at the air in an unexcited manner. If, on the other hand, you play Soul Calibur by mashing buttons randomly, your character will pull off all manner of crazy and impressive moves that will combo flawlessly and kill your opponent in seconds.
Trying to figure out HOW you did all those moves will result in your character just standing there and dully slashing again, and getting easily beaten by your opponent who is randomly mashing buttons instead of making the mistake of thinking you can learn how to play Soul Calibur.
DOA and Tekken follow the same rules.
The genuine midpoint between the two game styles is probably KOF Maximum Impact, which largely plays like a 2D fighter but adds some movement on the 3D plane - and more importantly, huge canned chain combos like a 3D fighter.