#1 Theo Walcott
Theo Walcott spent more than 10 years of his career with the Gunners. at the age of 17, he made his first appearance for the England national team. Everyone would have thought that he was bound for stardom. Unfortunately, that was all a dream.
Hampered by injuries, his 12 years at the club saw him make only 399 appearances for the team in all competitions. The forward was one of the fastest in the English Premier League and feared by many defenders who are unable to keep up with his pace.
Many a times, Walcott's finishing let him and his team down. As a forward, he scored only 108 goals during his time with the North London club. Many say that too much was expected for the Englishman and perhaps this was the best that he could have done. If he did not suffer all the knee and ankle injuries, he probably could have played more games and performed consistently.