My god, is there really any need for all this discussion about how scientifically accurate it is? It's a film for entertainment purposes, not an educational documentary! If the tiny holes in the science behind it stops you from enjoying a film then you need to get over yourself. I don't know how accurate it was, and it doesn't matter. It looked awesome, sounded awesome and, in my opinion, was very entertaining. You might not have liked it, but, technically, it is, undeniably, an excellent piece of cinema. If there are problems with it, they certainly aren't that it is scientifically inaccurate, because it really isn't a big deal whether it is or not. If anyone else had done this film I guarantee it wouldn't have all this scrutiny around it.
Oh, and I thought Hathoway was actually quite good, as was all of the acting in my opinion.