I agree with the fact that a new saw isn't that sharp. I don't think plane blades, chisel blades, or saws are accurately "honed" to the best of their ability.
But, it takes a LOT of time to sharpen a saw correctly. I've always had problems with skipping a tooth, by accident. That can throw everything off! I truly admire anyone that can sharpen various blades. It's an acquired skill.
cheers
bird.