#4 Both Orton and Nakamura are smooth ring technicians

When two wrestlers form an alliance, it's important that one doesn't overshadow the other. For example, Diamond Dallas Page's over the top personality eclipsed Chris Kanyon's when they teamed together both in WCW and WWE.
In terms of personality, it's already been established that Nakamura and Orton would mesh well as a unit. However, they also have a ton of compatibility with regards to their technical wrestling ability.
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Nakamura is known best for his striking, and Orton is famous for punts and RKOs, but the fact remains that both men are wily veterans who can utilize technical wrestling when it suits them. While neither man may be the second coming of Dean Malenko (and to be fair, who is?) they are both far above average in terms of technical acumen.