I can attest to how good Stoutland is. As a user of it on my sand team, it is a really good revenge killer. However, when it comes to Stoutland vs. Terrakion, Stoutland will not win. It really needs a partner that can handle Terrakion (i.e. Scizor).
There's no way Stoutland is sweeping through an entire team on its own. Like every Pokemon, it needs appropriate partners. So I have no idea what point you were trying to get across by making that post.
I've used Stoutland before and it's a pretty good cleaner, especially in tandem with Magnezone + Reun being perfect partners, breaking Heatran, Skarmory, Scizor, and potentially Terrakion if you get Terrak vs Reun 1v1