When I switching my main ,I mostly choose water main and when I need team dealing a lot of DMG Kisame is perfect. Yeah its true that he need time (or just chakra) to be trustworthy in his Sword attacks but even beside that 2rounds of Kisame and Main Shark Bomb Jutsu cooldown means U can bomb enemy without any break ,I used him with Tsunade and Hidan (quick healing x3,main neurotoxine can cause stun,tsunade can initiate chaos,kisame acupuncture and stealing chakra) and was pretty effective if didnt fight against some op "pay for win" team. So he is one of my favourite sword users ,and useful ninja