Interstellar

I had read a really bad review in the Sunday Times, so I was worried. But the 2 hours 45 minutes went really quickly, so that's a good sign. Interstellar wasn't science-fictionny enough for me, but it wasn't a bad movie. But what with Hollywood's obsession with cute kids and a happy ending? And why did it have to have a baddy that was so obvious? And how did the hero keep his farmer's tan through months/years in space?