Underrated topic
Fielding should encompass catching, flexibility across field positions, ground fielding and hitting the stumps.
Johnty rhodes was considered the best because he is a star across all the spectrums in fielding.
While catching alone will include many gun names from Yuvi, Kaif, Gibbs, collingwood, ponting etc, I personally rate Jadeja just a notch below Johnty rhodes because he hits the bar across all the metrics for me.
While Jadeja may be surpassed in have safe pair of hands by some legendary point fielders, none comes close to him in hitting the stumps consistently with a rocket arm. His presence alone used to save 15-20 runs in ODI for India.