Naut is pretty damn good actually. His biggest weakness is if he gets invaded early (which is just about any tanky jungler's weakness atm). Your shield stays up for 10seconds so at 1:46 use it, you'll get ~2 attacks off on gromp and with be able to shield again almost immediately.
I love naut. Plus his W shield when you get items is damn insane. I usually like rushing mobos & warmogs on him and you just run with a fuck load of hp + shields, tank towers & just cc the hell out of everybody. He has a huuuuuge mid game spike if you don't get behind early. He's probably easily the tankiest champion in the game at level 9.
This naut talk makes me want to go play him lol, although so far I've only been playing Fiddle, Yi & Cho'gath in jungle.
edit:
Why did Yi ever fall out of style? TP/Smite Yi is still amazing. Plus it's Yi, if you ever get fed you just can't lose.
edit edit:
Then I get Naut in aram, hahaha. Fk yeaaaaaaaaaaa!