#3 He matches up well regardless of the opponent
Whether he is facing someone 50 lbs lighter or 50 lbs heavier, Samoa Joe can compete with anyone in the ring. As many may recall from his time in Ring of Honor and TNA, Joe competed against some of the stiffest strikers in the ring. His matches and rivalries with the likes of CM Punk and Nigel McGuinness were an early example of how someone his size could move around the ring with guys that were lighter than him.
When he was in the ring with the likes of Abyss in TNA, it tested Joe's ability to strike and move with a wrestler that was both taller and heavier than he was. The key to his matches is Joe's conditioning; his in-ring stamina is tremendous. His matches won't end in a few minutes because he is able to attack consistently, and still sell the offence of his opposition.
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On the other hand, while Lesnar has a similar ability to develop his character and strike, his matches don't last a great deal of time. It's a strength Joe certainly can showcase in their match against one another.