I will start by saying I LOVE Interstellar, just as much as I loved Inception. Both are spectacular, though-provoking movies, although I must say that I enjoyed Interstellar quite a bit more.
I really enjoyed the exploration angle, and the approach they took to it, and I really enjoyed how the movie portrays the wormhole, the black hole, time dilation, etc..
I thought how they showed the wormhole was brilliant.. I studied nuclear engineering in college, and I study astrophysics and astronomy now, although not working toward a degree at this point, so I have a solid understanding of a lot of the science that they cover in the movie, and they got so much of it right.
Yes, there were quite a few things I thought they got very wrong, but so what.. the movie was beautiful, awe-inspiring, and powerful.. I picked up the special-edition Blu-Ray and I've watched it a few times now, including in the theater, and I still find myself getting choked up by many scenes in it.
If you haven't watched it, watch it. It's a 'wow' kind of movie.