Please make a difference between Eboue the winger, and Eboue the fullback.
He has his limitations, but not his fault he is played out of place, Wenger had the gaul to play play him not only in the wing, but in the left side of it in the last game, which is even way more out of place for him.
Eboue is annoying, but he is DOUBTLESSLY better then Grygera, who is not good enough either defensively or offensively (defense supposes to be his strenght, but too few realize he cant hack it enough there either). Eboue is way way better offensively, and is decent enough defensively.