Come On!

even the last fight was kindd of a letdown, as the whole movie was, I waited so long for that movie, did not know there was a trailer of this one, cause Jacky Wu is cool I will watch it!

Actually...that is all the info I needed.

Already saw that final showdown on youtube...and *ouch* that was a disappointment!

All other fights are even worse?
That end-fight suffers from many conceptual flaws.
One being that it mostly consists of Jing warding off the assaulting thugs with rather ordinary attacks. Those attacks look good, when performed by Jing, but I'd expect a lot more from a showdown with a martial arts superstar.
Another flaw was that Jing hardly seemed to be under stress by the fight. I don't mean that the stress should have been visible on his face...but in his actions.
There was an overall lack of tension between Jing and the thugs. And a lack of visual elements to emphasize the weight/meaning of this battle.
Instead it just seemed like a sport.
Two teams fighting each other in a rugby match.
The odds were a bit off...but little else hinted at the epic scope of this battle.
Changes of pace during the brawl may have helped. And a more drastic change of fighting styles/maneuvers to accommodate to the surroundings.

But as is, the showdown depicts a very ordinary (unimaginative) "1 vs mob" sequence.
Nothing outstanding or memorable.
I actually think you could have used any martial artist for this.
Waste of Jing's talent.