Yes. Germany came within spitting distance of Paris thanks to the Shlieffen plan, and was only hobbled at the eleventh hour by overextended supply lines.
Meanwhile, the Entente was counting on the Russian juggernaut, with its millions of men to overrun East Germany. The Russians saw great successes against Austrian forces, but met a complete disaster when they engaged the Germans. As it turned out, the Russian empire was a paper tiger - completely unprepared to fight a war.