You're going to have problems with at least 1 out of 5 of any manufacturer's computers; Dell, Gateway, Compaq, eMachines, it does not matter. These types of complaints about specific manufacturers mean nothing.
I own 4 Dells, 3 desktops and one laptop. The only problem I've had is the battery on the laptop finally died after 2 years and 3 months of usage (dell laptop batts are only rated for 12 months). When I did tech support for Dell, I heard no end of problems from customers about problems with Dell. The year I got taken off the floor they were expecting 14 million calls ... out of more than 150 million units sold.
IMO, that's pretty darn good for any electronic equipment manufacturer.