Buggy's biggest strength is in
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and his overpowered haxx devil fruit power the chop chop fruit which can re-attach himself even if he was sliced/stabbed with Haki.
His weapon of choice is also a
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.
Despite Buggy being physically pathetically weak, almost uncoordinated, and pretty slow he still played his part in the Pirate King's crew for a reason. He was the Usopp of the Pirate King's crew and he was just as cowardly, however the captain still saw something in him that's very valuable that he can add to his crew.
Usopp had his Seeing aura/Sniping skills and Buggy had his haxx devil fruit powers and his Buggy balls.
Zoro's not going to be Buggy by just cutting him up even with his powerful buso haki Buggy could just attach himself together. Zoro would just play into the running gag that is buggy and knock him out with the butt of his sword or punch him out with a haki punch.
The Buggy's Delivery will give him some problems if an old dying Whitebeard admitted that it's best not to fight those guys and take out the World Govt. at the same time.
I'm talking about the crew pre-dressrosa arc with the giants on their side.
Edit:
To just round up what every knows and is thinking without going through all this literal explanation for something so easy to figure out. Zoro wins neg difficulty.
