Please keep in mind that this thread is regarding the downside of DVC. And since that question was actually asked, anyone who responded is giving an honest opinion of their own experiences. If you posted a thread about the upside you'd see all the great things about owning.
That said, we've been members for almost 15 years now. We've stayed in OKW, SSR, AKV, BWV, HHI over the years. I've never had a room that I would consider old or worn or in bad shape. Do things age? Of course. Have they been so bad it would be considered unacceptable? Nope. Everything was in good working order 99% of the time, the other 1%, one phone call and it was taken care of (a running toilet or an uncleaned porch). We go multiple times a year, as you can see from my signature, so this is NOT a recurring issue.
We've stayed in 5 star hotels, other timeshares and that other resort in the area

, and not one place has met Disney standards in our experiences. In cleanliness, friendliness, helpfulness and personal attention, or vacation experiences.
You have to want to be in Disney. That's the entire point of owning DVC. Like anywhere else you purchase a timeshare, it's the place you should want to go to the most.
I have a co-worker that purchased a timeshare in the D.R. It's where his family goes at least once a year because it's the place they love to vacation in the most.
Another co-worker owns a timeshare in Aruba. It's where their family travels 2x a year. Trade-outs are infrequent, they bought where they loved.
It's the same with Disney. If it's where you want to go most of the time, DVC is perfect. We've traded out through RCI only once. Rented out our points only once to finance a hotel in Charleston for a 5 night stay, stayed in HHI two or three times (that's not a trade out, as it's part of the DVC resorts), and loved it enough to know we'll go again. We used the concierge collection once as well, and will use it again.
We are VERY possessive of our points and make great use of them. Disney is our favorite vacation destination, with or without kids (doing Disney as an all adult party is fantastic!)
I am the planner and make use of my points allowing for an average of 22 nights a year in different resorts, room sizes and for length of stays.
If this is the place you know you'll go again and again and again, then really, what could be bad? JMHO