That depends on the market and how much deferred maintenance we're talking about.

In some places buyers will bulldoze perfectly good homes just to build a different one, just because the land is so valuable.

In other places, there are abandoned homes that municipalities can't even give away because the cost to bulldoze is more than the land is worth.

If the place you're in looks more like the former, maintenance doesn't matter as much. If it looks more like the latter, maintenance is going to be more important to your sale price.