I have been using Flipkart from past 4-5 years and I have bought a lot of products from there. I have never faced product issue in this span of time.
However, I am not sure if people really experienced issues with FlipKart. I bought almost everything of my household from flipkart, be it a needle to laptops, speakers or anything. When I neeed to buy something, I first go to Flipkart to check the available product and I compare the price from the market and seriously the price offered by flipkart is very less than in the market. I would always prefer to use flipkart as a first option of purchasing any product.