I don't like the current nautilus, and I think the upcoming versions are just going to make it worse, so why doesn't Ubuntu make it's own file manager? Just like Mint did with Nemo), or at least fork Nemo, I don't think I'm the only one who has this idea.
closed as primarily opinion-based by Maythux, Florian Diesch, Tachyons, fossfreedom♦ Feb 8 '14 at 16:00
Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.
Just use Nemo - it was created as part of the Cinnamon desktop, on Linux Mint, due to similar loathing to Nautilus - though it is based Nautilus 3.4, and still has the dual pane feature, and other things, that Nautilus had a while back.
There is a helpful question here on making Nemo the default File Manager.
Wiki page on Nemo here - other file managers are listed at the bottom.
If this is not what you want, see @blade19899 's above comment.