Totally agree with Mr. F here. Tutorials have a place, but that should mainly be when it comes to very technical things. Like tutorials for a specific program (which does not apply much in 2D, but in 3D it does). Tutorials for drawing specific things like trees, eyes, bricks and so on are pretty pointless imo. Just look at real instances of what you wanna draw and simplify from there.
I know this may sound a bit daft to someone starting out, but the best lesson you can learn about anything is that there are no shortcuts to getting good. The only thing you can do is put in the time to become good.
So in that case specific C&C is a lot better because it allows people to point out where someone could use improving.