The answer is... You like/ are used to having appliances in the houses you look at.
Are you buyiong this house for you or as an investment?
If you are buying for you, this is a bonus, as you will get exactly what you want and not settle for whats there or in the end replace whats there and have to dispose f what you bartered on.
If its an investment property, there are 2 investments Flip or Lease, If you flip it you will want to spruce up abit and 15 year old appliances really are not an upsell, if you rent, a quick trip to the Rent A Center can put you in some nice appliances for quick and cheap. This would be paid as part of the rental, until paid off and then you just gave a boost to the net income.
Appiances are just someone not wanting to carry them with when they moved. it is not really a plus or minus to the sale. If they left them, its not really that good of a tool. ( they didnt want them anyway)
Hope this helps