Germany

they had no chance. The End.

that was impossible in its own.

hell no, it was stupidly rigged against them in WW1. At least several countries stayed neutral for 2 years in WWII. Germany made friends with a dying Ottoman Empire, and an Austrian Empire that was splitting apart at the seams. At least Japan had a proper army, and distracted most of the USMC from participating in the Western Front. 

Ottoman Empire may have been dying but their army was anything but dying after German advisors arrived and reformed it.
Germany was the most powerful country in the world, even more powerful than British Empire.
Austria Hungary was a great power, their Empire was not splitting apart, only a handful of Serbs were angry, Austrians, Hungarians and Poles were generally liked it, Croats and Slovenes were not enthusiastic about Austria Hungary, but they hated Serbia, they believed that they have better chance of gaining Autonomy in Austria-Hungary than in a South Slav nation dominated by Serbs. Romania was pro-German due to having Monarchs from same family.
Austro-Hungarian army performed very well when under competent leadership, its role in success on Eastern Front cannot be neglected.
As of Bulgaria, I have three words to say- The Balkan Lion.

Compare this to Entente.
Italy's conduct of war was disastrous, they sent their men to attack on fortified Austrian positions without adequate training and equipment suitable to high altitude mountain warfare. They treated their soldiers worse than any country did, even adequate food was not provided. They did this for whole 2 years.
Russian Empire was no Soviet Union. Even though they have huge manpower, they do not have capacity to feed and equip them. Most of the soldiers fighting do not even have rifles, they had to wait for fellow soldiers to get killed or wounded to get a rifle, if their weapon had not been captured already by the enemy, no wonder over the outcomes of Tannenburg, Masurian Lakes and Gorlice-Tarnow. Germans outclassed them even in Winter Warfare.

Serbia was just too weak and it only held out till 1915 because of complete incompetence of Austrian Commanders who did not even cared about Logistics, Artillery, Scouting and Communication.

British and French generals were not very competent either too untill 1916 (though nowhere close to Cadorna, Enver or Austrians), they atleast cared about logistics and their troops' morale but always outdated a little in tactics resulting in resultless offensives of 1914 and 1915.

USA was neutral for 3 years in WW1.

Germany just needed to knock French out of the war and British out of the continent atleast.

They were more close to knock out France and Britain in ww1 than USSR and Britain in WW2

What did you thought? Everyone who has decent knowledge about both wars believes it

Russia was defeated in ww1 and war was not that much popular in USA either.
It was stalemate till Entente was attacking. German spring offensive broke through the Entente defenses. The first attack was halted just near Amiens, the last defense connecting the French and British. If Germans were successful in capturing Amiens, they would have separated British and French forces. They were on the rear of British forces and Amiens was an important Railway junction and if fell to Germans, will allow them to encircle British (as they did in 1940]. British had planned that they will evacuate the continent if Amiens fall.