Remember last T20 World Cup, in that also Ravinder Jadeja was simply burden on Indian cricket team and because of his slow performance.
In this world cup also he is simple a burden on Indian cricket team and occupied one birth which can be utilised for much better player like Irfan Pathan or any shining star of IPL.
Against Australia he gave 38 runs in 2 overs.
Against West Indies he have 27 runs in 2 overs.
Because of his poor bowling Australian got in attack mood otherwise Harbhajan was containing them beautifully.
I do know what is the reason behind this that he is still in the team.