Captain Obvious to the rescue!!!!
Nah, the village size is comparatively smaller than others, that's why it is considered to be weak besides that, i don't feel its a weak village, why ? Because the 3rd kazekage later turned into sasori's puppet was considered to be one of the strongest shinobi of all, which implies that village is not weak as it is considered, got it
The Third Kazekage was consider the strongest Kazekage not one of the strongest shinobi.When you compare the Third Kazekage and Kazekages in general to the Kages of other village The Third Kazekage and the Kazekage in General are weak.I mean, the Fifth Kazekage was fodderized by Orochimaru, Gaara lost to Diedara (even though he was protecting the village at the time, and The Third who was consider the strongest lost to Sasori.Just off the top of my head, both the
Onoki and Muu from the Hidden Stone would destroy any Kazekage in battle.
The Third Raikage, A(Fourth Raikage), and Killer Bee would destroy any Kazekage in battle
Hokages one through Sixth(Danzo included,Itachi and The Sannin would destroy any Kazekage in battle
2nd Mizukage, Fourth Mizukage, Kisame and possibly The Fifth Mizukage and Mangetsu would destroy any Kazekage in battle
When you think of it, there are a lot of shinobis from other village whose strength is above that of a Kazekage