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Many fans have said that St-Pierre's performance was boring, and to a certain extent, I'll agree.
But that isn't all St-Pierre's fault.
Part of the reason that the fight felt boring was that it quickly became clear that Jake Shields had no real way to victory unless St-Pierre obliged him, and took the fight to floor. Shields couldn't come close to taking St-Pierre down, and unless the fight went there, Shields had no way to win. That isn't St-Pierre's fault.
Because of the fact that Shields' only method of victory was on the ground, it's stupid to criticize St-Pierre for keeping the fight on the feet when it was apparently so easy for him to do so.
Also, the striking exchanges on the feet weren't objectively boring. There have been far worse main events even in recent memory. St-Pierre's win over Shields was still far more action-packed than Frank Mir vs. Mirko Cro Cop, Randy Couture vs. Brandon Vera, Couture vs. Coleman, Silva vs. Leites, among others.
Even main event fights like Nate Marquardt vs. Yushin Okami were really only more exciting because they were more competitive, which again, isn't St-Pierre's fault.
The fact that he wins dominantly is praise-worthy, but it's his dominance that makes him boring to many viewers.
Aside from the dominance and competitiveness angle, the other thing that made the main event at UFC 129 deflating is the acts that it had to follow.
After Mark Hominick's heroics, Lyoto Machida's crane technique, and Randy Couture's emotional send-off, anything less than St-Pierre knocking off Shields' head with a dragon punch would have been anti-climactic.
That's not to mention everything that happened on the undercard.
Prior to the main event, UFC 129 already looked like one of the greatest and most entertaining MMA cards of all time. A let-down was all but inevitable.