I have used Flipkart, Amazon, Letsbuy, Ebay, Snapdeal, KOOVS.com... and my rating wud b:
Amazon: 10/10 - Awesome Prices, No delivery issues
Flipkart: 9/10 - Best Prices, No delivery issues
(No issues, but amazon got 10/10 for making it happen on international shipments :=))
Letsbuy: 9/10 - Flipkart younger bro
Ebay: 7/10 - Once ruled the roost, its downhill now. Was the era before Flipkart and Letsbuy arrived at the scene. Now, good only during discount seasons
Prices were best before other ecommerce sites popped up on the scene. Delivery was always tricky as it depended on individual sellers.
Snapdeal: 4/10 - All 4 point for prices, delivery is ZERO. Took 12 days to start shipment and then when I finally received the item, it wasnt the one I asked for. So had to return it. Now the wait had begun for the refund.
KOOVS.com: 3/10 - Again 3 point for prices. ZERO for delivery. Shows 25% cash back at time of purchase. You never get that coupon to use that cash back. Delivery never happens. Had to finally cancel the order. Thankfully got the refund.