A tripod will make your shots a lot sharper: if you have an adequate lens, it will make it look better. The logic is that people's hands shake, even if it's not apparent to the shooter, and that you want as sharp an image as possible, so there's no movement at all. Your landscapes will appear crisper than if you didn't have one; when you have a really boss image you want to enlarge, it wont look fuzzy. The most dramatic shots, for landscapes, are early morning or just before dusk, when the light is not great, but shadows are dramatic: low light. The slower your shutter speed the better the image, so a tripod will definitely help there!
Hope this was some help,
Jaybird