I actually gave it to my secretary because she used to have a Galaxy phone. Last year she got rid of it and bought an iPhone 5c. She has zero interest in this Galaxy Tab 3 I gave her and, like you said, it's collecting dust in her office!
That Tab 3 7.0 is a terrible tablet and that's coming from someone that likes android. It's laggy, buggy and all around not very good for much actual use. I've used one on multiple occasions and someone at work got one through their sprint contract as well. The only thing I ever see him using it for is watching Hulu and checking baseball scores. If I were to give it to someone like my mom who lives on her iPad she would hate it.
The only tablet in the Tab 3 line I would ever consider buying is the 8.0. The Tab 4, S and Pro line are much better.