The biggest issue I think could impact a DVC owner is the availability of DVC resorts at certain times of the year.
There are times, especially December, when DVC books up quickly and if you want to stay during this time, you have to be prepared to book 11 months out. While it is not impossible to get reservations with shorter notice, the chances of getting what you want, without having a split stay could prove fruitless if you are not planning well in advance.
If you are someone who wants the flexibility to always plan and go on trips without much planning, you could find DVC frustrating.
It doesn't affect us because I teach so I know when we will be going yearly (in August). This will always allow me to book my trip at that 11 month mark.
We also bought at the one resort we knew going in we would love. This prevents any disappointment as we can pretty much always get it when we book. Even if the SV rooms at BLT (which is what we book to maximize points) were gone, I don't think we should every have trouble getting a room when booking when we do.
Good luck!