#5 Papiss Cisse
This might be a case of a half-season wonder, though his following seasons were not as bad as the others on this list.
Cisse, who was signed in the winter of 2011-12 by Newcastle United to support fellow Senegalese striker Demba Ba, set the Premier League alight with an electric start. He banged in 13 goals in the 14 matches that he appeared in, leading the Toons to a stunning 5th place in the table, ahead of the likes of Liverpool and Chelsea.
He is most remembered for the wonder goal he scored against Chelsea, when he chested and then curled the ball with the outside of his foot over Cech from 37 yards out.
However, the following seasons were not as fruitful as he lost that goal scoring touch and went on to contribute only 31 goals in 117 further appearances, most certainly not the numbers expected from him after that incredible start.