Tax refunds act as forced savings for many people. It's not a good way to save as the government pays no interest on the savings. The the people then blow the money immediately on major purchases or paying down debt buildup.
Personally, I always tried to make it so that I didn't get a tax return. I always figured it cost me significant money in cash flow through the year. Always pissed me off to overpay in taxes when I could have used the money for critical things I needed during the year.