These are some of the good things I found about Citi cards (some of them are not unique to Citibank cards of course):
Citibank are honest about the services and charges on their card.
If you miss payment they call you to remind you so that the interest does not keep accumulating.
Lots of repayment options and ATMs.
EMI facility for bills above Rs. 2500 (although I’ve never used that)
My only complaint is that the rewards on points are bad compared to cards like SBI. Probably the only good option is that you can claim the rewards points as cash back.