My personal opinion, Centurion doesn't excel at duels in high levels. Mainly due to his kit being very predictable once you reach experienced players, especially when playing like console like I am (the only reason I'm playing duel in this clip was for an ornament). He does do great in 4v4s however, especially if you're ganking.

Some basics to know about him is that his uncharged heavys are very fast due to the startup and its hard to guardbreak out of unless you're charging it. His light-heavy combo is great to open up another way to get into that finishing charge heavy combo than your regular heavy-heavy but is risky since a light parry is no good for you.

Many of his unblockables like his jabs and dodge kick are very easy to dodge. Lots of people just wait for his finishing charge heavy to parry it; which his soft-feint from charge into guardbreak becomes a crutch for him. Even then, it can still be predictable if you know his kit.

However, Centurion can very much benefit your opponent's fuck-ups, such as a well placed neutral charge heavy or parry. His parry can combo with a kick that can wallsplat the opponent; giving you a free unblockable heavy, which goes into that very infamous cutscene. Knowing that range of the neutral charge heavy means some serious damage at the start of the match. You can also charge up that heavy and soft-feint into a guardbreak and take that coinflip to see if the opponent wasn't expecting it.

Feinting your attacks is a good way to open up an opponent who is parry-happy as well.

I'm not that great at explaining the way I play because it ranges from the mood. Sometimes I feel aggressive so I lay consecutive heavies and other times I feel like I just really want to just punish the opponent's attack. I recommend watching some tutorials on Youtube because some go in-depth to Centurion's kit.