Fixing your house up for sale is highly recommended in the current market if you hope to sell within a reasonable period of time and for an acceptable price. Today's buyers want turnkey houses that they can move right into without having much work.
In addition to repairing defects that might turn a buyer off, your house should be clean, tidy and look attractive. From a marketing point of view, most homes contain too much furniture and knickknacks that make it difficult for buyers to appreciate what the place has to offer. If your home is too personalized with your own belongings, buyers might have difficulty envisioning living there.