Would nasus ba a good champion to climb with?

My "main" top laner is shen right now. I've realised that in most cases where my team is behind and/or won't go in, looking like they're scared to fight (thus letting their team engage and get kills while we're not really doing anything or only half the team is, while the other half is just buzzling around), I can't really do anything to change the situation, and that sucks to be powerless - both damage-Wise and, well, being able to make a difference. It doesn't help that since it's SoloQ I miss many opportunities to use my ult during laning, which ends up in me using it in an attempt to save a low-health ally most of the time.

With all that in mind, I came to the conclusion that maybe I should get a new top laner that would do more than soak damage, one that can take a few hits while giving them back. And who could do that better than Nasus, the champion that seems to be unkillable once he's got an item, Nasus, the one who never ceases to grow in power, Nasus, the god who more than once i've seen carry his team?

Point is, would nasus be a good champion for me to pick if i'm looking for a tank that can carry a losing team - or any team, simply, without needing too much coordination? Or, well, whatever you could deduce from my text or something.

TL;DR I can't use shen to his full potential, if my team won't fight/is behind I feel useless and i'm sad, if I play nasus will I be able to carry?