The phrase "a much more usable" is correct and usable in written English.
It can be used when comparing the usability of two or more items, indicating that one is significantly easier to use than the other.
Example: "After the redesign, the software is now a much more usable tool for our team."
Alternatives: "far more user-friendly" or "significantly more practical".
One day, the Nook may be a much more usable, more capable bit of gear.
The Surface has been around since 2007, but the new and improved SUR40 is a much more usable device.
It's a much more usable interface than what came before, with a scrollable rolodex that doesn't leave you feel like you have to travel miles to find apps that you opened early on in the queue.
CRP aims to provide a free, open and much more usable resource, and this is our first step.
A recent firmware update to the device, also made the UI much more usable for scanning a lot of content.
However, Windows 8 runs slightly faster and uses less memory than Windows 7, and the latest Windows 8.1 Update 1 is much more usable on a traditional laptop.
Most importantly though, it's much more usable as a device.
This 13-inch laptop is as plain as can be – it has just two USB ports and an SD card slot – but becomes much more usable when you realize the various configurations you can bend it into.
As far as F1 is concerned, the Mercedes engineers and their counterparts at Ferrari and Renault are talking about building engines that produce about the same power as they do now, but with much more usable torque, providing a potentially better spectacle and using 30% less fuel.
While this does nothing to help the cramped feeling — your thumbs will still crash together on any letters less than three keys apart — they've also changed the overall button shape: they're skinnier than they are tall and seemingly a bit "deeper", which somehow makes them MUCH more usable.
"It has the potential to make both cellphones and P.D.A.'s much more usable".
