No, % is meaningless. What would you rather have? 60% of 7,000 or an uncompressed 3,500?
Having said that, try to get things in the 4,000+ range, if you can (especially if the movie has lots of high action sequences - movies which just have people sitting round talking can easily be done at lower BRs). 3,500-4,000 will still be excellent. This ignores things like quant - which is as important as BR.