Naruto Chapter 499

[Yukimura]

Naruto knows at least 4 jutsu that are combat effective. Rasengan (in multiple sizes), Fuuton Rasenshuriken, Summoning, and Shadow Clone. If you also count Sage Mode as a jutsu that's 5. With sage mode he is super strong, super fast, and super tough, has chakra sensing, and can use a ranged attack that is nigh unblockable as long as it's on target. What more utility could he get out of something like other elemental techniques?

In terms of practical combat his fighting style is pretty well equipped for his preferred role of front line brawler. All he has to do is connect with a Rasengan to finish just about any opponent who doesn't have some sort of super healing ability or isn't a demon. With sage mode he can probably out perform most ninja well enough to get a shot or two at them with a Rasengan. His biggest weakness currently would probably be genjutsu which could conceivably be covered with summons or an as yet unrevealed sage mode granted immunity to genjutsu.