In general I think the fights are a little less electrifying than the ones from the previous two installments, but very good and entertaining, if not great. Martyn Ford is a good final boss and of all the really big bad guys in martial arts movies is definitely one of the scarier looking. Very streamlined and focused, the plot is a vehicle to move us from one fight to the next and to demonstrate Boyka's progression as a character. Boyka has a coherent character arch and Scott Adkins performance is quite good even when he's not kicking the s*** out of people. Hoping for a part V.
I am not going to say too much about the movie because I don't want to present any 'spoilers,' but I have to say this is one of the top action movies out, although very under the radar. I first watched Undisputed I without ever knowing what it was, just saw it lying around at my friends house and watched it. It caught me completely off guard. Then I watched the second and I just finished the third.