Letting dhoni off the hook for his slow over rate because his team can't bat more than 60 overs would be ridiculous and the next person who gets suspended would have every right to complain about double standards.
The last thing we need is the ICC handing out different punishments to different skippers, international cricket boards/players are temperamental enough without giving them more reason to cry about favoritism.
Lets remember dhoni was warned just a few months ago about this he was then informed DURING the game that he was facing suspension if he didn't improve the over rate and yet nothing was done, he either didn't give a rats or he's too incompetent to get his house in order, either way he deserved the suspension and should never captain a test team again.