We've been in our rental house for a little over a year now, and I am realizing I have an apple tree problem. It was a minor problem last year, but I have realized it is major...

This tree produces the world's nastiest apples. They are just balls of apple flesh. No juice and no flavour. They're nasty for eating, virtually useless for baking, and forget about juicing them. I know that this tree has been neglected by past renters, and that it is also a very old tree. Can I rescue the harvest for future years with some intervention, or is this tree just too old to produce good fruit (is that even a thing?)

I didn't mind too much last year, because I guess it was a bad year for apples. But this year I have SO MANY. I came back from vacation on Monday and literally had to take a snow shovel to my back yard to clean up the drop of slightly fermenting apples. And every day since then, there have been 5 new apples a day on the ground... and I don't want to eat any of them! The only beings that want to eat these apples are deer, who now seem to be treating my back yard as the hottest new al fresco dining spot...

So, can I rescue this situation? And, if not, any suggestions for things to do with apples that are dry, flavourless, and meally? Besides turning them into compost? Because that's all I got...