I have a 17-50 2.8, I needed a 50-150, GOD I have been on this site a week and I am done. You guys are the biggest bunch of snobs I have ever seen on a web forum. No support for the newer guy. Just you should do this you should do that. Wow talk about crushing the student on a budget.
Now come on chief, you don't tell us about your situation, and then you complain about what people think... We are all allowed to have opinions about what's the best setup, but usually people speak for themselves.
You bought what you bought and I for one certainly hopes it will fill your present needs. Since I don't know what you want to do with your equipment, I certainly can't offer my thoughts except that I think the D7100 is a fine camera and if you have the right lenses for your subjects, you can go a long way with it.