Kisame was a beast without his sword. Unfortunately, Guy had the edge against Kisame's fighting style.
Likewise, Zabuza has quite a few unique water-style attacks, even if he's currently using a Kunai (of all things...).
Kisame was able to somehow kill the previous owner of Samehada in order to earn it.
It IS unfortunate that he won't get to see the previous Seven Swordsmen without their swords... maybe it's a sign that we'll see the rest of the blades wielded by the current swordsmen. Remember, Kakashi is in charge of the close-range fighter division of the joint Shinobi forces. It's pretty likely that one or two of the current swordsman are a part of his division.
what ever happen to ninja villages hiding there dead so other ppl can find there can steal from them.. how did kabuto know where to find all of them ninja to take there blood
As people have pointed out, it wasn't necessarily the DNA that was entirely destroyed by the villages, but simply the unique aspects of their body (Danzou crushed Shisui's Sharingan before his death to prevent Madara from getting it, but Kabuto could simply have used the crushed eye-juice to Edo Tensei Shisui himself).
The key thing about a person who specializes in human experiments is: they're really fucking scary! I mean, not many people would risk death just to hide the location of some dead shinobi.
kishi is getting lame.... why is he not continuing on the anime's main story....?!?!?! and why the F**k are the enemies looking like that they have the edge on the war... i hate to think that some of the cool characters are goin to die....
Also, the bad guys are supposed to look like they have the edge in any good story. That's what makes it exciting to see how the heroes prevail. How interesting would it be if it was Tsunade spamming Edo Tensei, and Sasuke was a good guy, and Naruto had Nagato's Rinnegan, and the only bad guys were Tobi and his army of weak Zetsu? There'd be no challenge. We want to see how Naruto manages to beat Sasuke's EMS, how anyone mananges to take down Madara with his Sharingan/Rinnegan, and how the hell the Shinobi alliance manages to beat Kabuto and his Edo Tensei. The army of Zetsus is just there to add something for fodder ninjas to fight.
My biggest complaint is the Zetsu army, to be honest. After all the talk about war breeding hatred, and both sides suffering, Kishi finally gives us a war, and it's clear-cut good guys vs. bad guys, and the bad guys are soul-less clones from Madara's absurd science experiment.
Kishi's given several examples of war's corrosive effect throughout his manga, Rlinfamous. At this stage of the story, there weren't any real pressing issues between neighboring countries that would cause the type of war you've eluded to (the Sasuke issue with the Cloud country was really the closest example).