Nautilus viable support in ranked?

So I recently picked up my loving giant and I've fallen in love. I enjoy his kit and his playstyle so much that's I've quickly in under 5-6 days gotten him nearly mastery 5 I have just binged played this guy and am seriously considered maining him. But in a recent game my friend said he wasn't too viable in ranked. I play him in the support role and generally go very positive for my K/D/A and get my carry fairly fed. Honestly I haven't had many issues at all but of course this isn't ranked and ranked is played much differently so I've come to ask your opinions. Thank you :)