When you first start painting, “you suck!” is not the advice you’re going to want. After putting down your first blotchy base coat and highlights thicker than a good gravy, you’re going to know this already and might seek a little motivation instead.
However, when discussing newbie painting, I’ve come to appreciate people saying, “you suck!” I wish someone had done the same to me when I first started. It sounds a bit cruel, but we all sucked once. It’s a universal truth that our first attempt is going to be pretty bad - we haven’t developed the brush control, the paint thinning experience, or an eye for how shading works on small objects yet. These are all skills you develop as you paint more, learn not to repeat your mistakes, and grow as an artist.
Every good painter has their history of bad paint jobs, many of them building blocks in developing a library of skills that have grown from those early failures. A bad dry-brush on one model can evolve into the perfect weathering for a tank later down the road. A library of failures is a great learning tool.