Dell consumer laptops are cheap. Dell consumer laptops from Walmart are even cheaper due to Walmarts Price fixing.
Dell Makes some great laptops but they are not sold to consumers which get a lower quality unit with a warranty verses a Business rated unit which is packaged with a service contract.
Computers with a warranty is a bet by the PC maker that the unit will function properly for the duration of the warranty period. They have an acceptable loss figure here for units which fail to last the duration and that is all figured into the cost to maintain a profit.
Service contracts make more money for the PC maker - so long as the unit never requires service. Therefore the manufacture uses more robust components in its business grade units so the service contract is never invoked. Just one service call can eat the profit margin of several units - Using top grade components which the customer pays for anyway saves on service issues.
I worked in warranty repair and Tech support for a major US computer Corp for 3 years before operations were moved offshore. I have seen the internal figures on this.
If you want a Dell Laptop - get a Latitude series they are better than the average consumer grade units - you might have to order online as a home based business, but trust me, support if needed will be better as is the hardware.
For the record I currently use HP as it had by far the best bang for the buck in a sturdy chassis (an issue Gateway has been fighting lately it seems) I also have had great luck with Toshiba units.