The reaction speeds of Ki-Adi-Mundi are incredible. Although most Jedi would have adapted to hone their lightsaber skills to blaster deflection during the Clone Wars, Ki-Adi held his own against the overwhelming barrage from Bacara much longer than most would have been able to.  He also sensed something was wrong long before the clones began firing. Combining this with the fact that he sits on the Council next to Yoda and Mace Windu would suggest that he is one of the most powerful Jedi in the Order. I have no doubt that he would've traveled with the other Council members to arrest Palpatine had he not been fighting on Mygeeto. I think it would be fair to say that Mundi is one of the most powerful Jedi, perhaps only behind the likes of Yoda, Mace Windu, Anakin, and Obi-Wan.