Yeah, the C-stick is good for all characters, though not necessarily good for all moves. I mean, if you just want to launch a smash attack on the fly, then by all means, tilt that stick. Certain aerials also benefit greatly thanks to the utility of the C-stick, like Meta Knight spamming Uair without having to use up a jump everytime he launches said aerial, which is what he will do if done by pressing Up and A. As mentioned before, you also have the DACUS (look it up, if you're unfamilar with that term) which - to my knowledge - requires C-stick usage to be performed. It's what makes characters like Snake and Wario that effective, and even helps others, like Sheik and other such characters... but poor Link. Ever heard of B-sticking? It's when you assign B moves to the C-stick, and characters, like Lucas, benefit heavily from that too. So, in conclusion, the C-stick is a powerful and versatile tool when used properly, so anyone that tells you that using the C-stick is a "noob" thing may end up being good without it, but I'm willing to bet they wouldn't last very long against top pros... because come on, I'm positive even they use the C-stick too.