I have him playing for my Villa team on 9.1. i bought him half way through my first season, and am now in my third season. First two years he had a poor goal return for someone with his stats, but he hadnt learned English, which personally I think is the reason for the lack of goals (although he did score some very important ones.)
3rd season he now speaks basic english and is a monster, highest average rating in the epl and top goalscorer with 18 league goals, its only christmas! I play him up with Keirrison who has also scored about 13 in the league but he has notched up a good few in the cups for me.
I must say though if you are playing as Arsenal I think you should be looking at the very best strikers in the game. The players I have mentioned are great for teams like Villa, ie not top 4. Think David Villa, Aguero, etc.