Yes it was.....
If the Schlieffen Plan adopted by the German General Staff remained unmodified by von Moltke after 1906 and proved successful with the capitulation of France in late September of 1914 after a 6-week war of movement, then an overall German victory was likely. In order to defeat the western allies, rapidly moving German forces would have had to quickly overcome resistance by the Belgian Army (assisted by the small 75,000-man British Expeditionary Force (BEF)), instead of being slowed down considerably by those allied forces. The war in the East would remain a defensive war on the part of the Germans in 1914, with General Paul Von Hindenberg stopping the initial Russian offensive in the first battle of Tannenberg as in OTL.
If France was knocked out of the War in autumn of 1914, along with the small BEF, then the war between Great Britain and Germany would have thereafter been a naval war and a colonial war in Africa. Germany would soon establish new submarine bases on the French Atlantic coast, and on the North Sea coast of Belgium and perhaps the Netherlands, while the English Channel would have been heavily mined by the both the British and the Germans. The Germans would have certainly tried to starve Great Britain out of the war earlier with unrestricted submarine warfare beginning in 1915. An armistice between Germany and Great Britain would probably end the war on far better terms for Great Britain than defeated France would have received in 1914 or than defeated Russia actually received in early 1918 in OTL.
With a victory on the Western Front largely secured in late 1914, and the naval war against Great Britain going reasonably well in 1915, Germany would be in a much stronger position in the East. The Tsarist regime in Russia could not survive another major loss after the disastrous defeat in 1905 to Japan. EITHER a reasonable early armistice ends the War in the East in 1915-16, with the cession of Russian Poland to the German Reich and some lands to Austria-Hungary as a buffer zone between the two nations, following the defeat of France and collapse the Triple Entente, OR the land war continues. A German/Austria-Hungarian victory is very likely in such a one-front land war, with a Treaty not unlike that of the Treaty of Brest-Litovsk being signed following a Russian military collapse and the fall of the Tsarist regime.
In the short-term, the German Empire under Kaiser Wilhelm becomes the uncontested dominant land power in Europe. In the West, Germany annexes Luxembourg outright and secures naval base rights on the French/Belgian/Dutch coasts. France and the Western Allies must pay war reparations and cede much of their African colonial territory to Germany. Great Britain emerges largely unscathed, the War having been costly but far less so in terms of both lives and treasure than in OTL. Italy cedes some border territory to the Austria-Hungarian Empire, but is otherwise largely unscathed by the war. The USA never enters the war, despite its anger at Germany over unrestricted submarine warfare in 1915, because Great Britain signs an armistice to avoid being starved into submission and ends the Western war early. Among the allies, only Japan, which has seized German possessions in the Far East, is satisfied with the outcome of the War.
In the East, either the Tsarist regime survives and cedes much of its power to the elected Duma following an early armistice with the Germans in 1915-16, or the Tsarist regime falls to a social democratic revolution with an armistice and treaty negotiated by the provisional govt which ends the war by ceding vast tracts of Russia's European lands to Germany. Without Western allies to be concerned with, the provisional govt would not pursue the unwise policy of attempting to continue the War. In the latter case, the situation in Russia is chaotic for many years as the provisional govt struggles against armed Reds and, perhaps armed Whites, to retain its grip on power.
The nominally victorious Austria-Hungary survives as a multi-ethnic empire under the Habsburgs, but gains little in the way of new territory and is thereafter subordinate to the victorious Germany.
The Great War ends in what may turn out to be a 20-year armistice. Ethic tensions agitated by War still remain unabated in the East--Czechs, Slovaks, and the various Yugo-slavic peoples within the weak Austria-Hungarian Empire; the remaining peoples governed by the weakened Russian regime; and the Poles, Baltic peoples, and others who have merely traded their former Russian masters for new German masters. Outside victorious Germany, Anarchists and Marxists continue to preach revolution on the continent. Italian fascism develops much as it did in OTL. France seeths with hated towards Germany after being defeated for the second time since 1870, and still dreams of revenge. The Third French Republic falls and a weak Fourth Fench Republic faces challenges from both the extremist Left and extreme Right, as it chafes under the initial German occupation and then struggles to pay war reparations. Russia can be expected to seek the return of its western lands from Germany, once it sufficiently recovers from the War and its own internal troubles. A stab-in-the-back myth develops in Great Britain as it chafes against the reality of both losing the War, without ever being actually invaded, and a German-dominated continent. That myth, plus an unpopular Ireland policy, leads to the fall of the Liberal party in the UK. The Tories form an enduring parliamentary majority and actively seek an Anglo-American alliance as a way of re-dressing the new imbalance of power in Europe.