mkvtoolnix-gui is a train wreck. mmg separates elements into different tabs, which keeps things organised and clear, but mkvtoolnix-gui dumps everything into a single window, so you end up with subtitle tracks mixed in with 50 fonts and other tracks. This considerably increases the chance of making a mistake when you're remuxing files with a lot of tracks or attachments.
In mmg clicking on a subtitle track actives the "Track name" box so you can immediately type the name and quickly tab through the other boxes setting the parameters. In mkvtoolnix-gui you have to manually click to activate the Track name box.
The regular popup messageboxes in mkvtoolnix-gui like "Do you really want to close it?" are annoying and get in the way of getting things done. Everything now takes more clicks than in mmg.
Having the properties on the right instead of at the bottom makes the window much wider, which leaves less space for your file manager window when dragging files in. It also makes the properties feel cramped.
Having tabs for multiple open jobs is stupid. How I work is to do one file, add it to the queue, Ctrl+N, do the next file, add it to the queue, Ctrl+N, and so on. In mkvtoolnix-gui this leads to you having a tab open for every job, which is more likely to lead to confusion and mistakes, while adding nothing of value. To keep things organised you have to close each tab after adding the job to the queue, which adds yet more extra clicks compared to mmg.
Why would anyone want multiple jobs open in multiple tabs anyway? Does he think people like to start one job, set a few properties, start another job, set a few properties there, then go back to the first job and do a bit more there? I suspect most people work the same way as I do, doing one file, adding it to the queue and doing the next. With that approach there is simply no reason to have multiple jobs open in multiple tabs.
I remux about eight files per day, which was no trouble with mmg, but with mkvtoolnix-gui it's an incredibly annoying and laborious process. I've tried to like it, but ultimately mkvtoolnix-gui is a design disaster and is simply not worth using.
I ultimately ended up going back to 8.3.0 and will continue to use mmg until it stops working. After that I'll put the subtitles and fonts in a separate Subtitle and Fonts directory so they're loaded by the player without having to be muxed in.
mkvtoolnix was a great piece of software, but now it's worthless.
Review by Jones82
Oct 14, 2015 Version: 8.4.0
OS: Windows 7 64-bit Ease of use: 1/10
Value for money: 1/10