Incorrect. You can be "good" with G&W that way against people that arent good anyway.You can just pick him up and be good with him, spam his aerials(specially the turtle).
Does G&W have any AT's?
G&W players' biggest issue is their telegraphing it is usually pretty obvious what the person wants/is going to do, if you cant get past that, then youll never be good. It takes a large level of creativity and control to actually be good.