I have used Vegas for many years and it is a solid program for video editing. It seems that those who don't like it had issues of some sort or the other, but I have rarely experienced those problems, and unfortunately, if the problem can't be replicated, then it suggests a problem specific to that user. And like the other users, I can only speak from my experience with the program, which has been good.
It is important to keep in mind that Vegas 13 was an excellent program, but unfortunately, Sony had other plans and stopped developing the program and essentially left it by the wayside while they focused on the Catalyst Suite, which, in my opinion, was a disaster. After Sony sold Vegas to Magix, Magix had a lot of catching up to do, which included adding GPU-accelerated rendering, ACES color correction, and many other features to the program. And again, unfortunately, new development causes bugs and of course, with so much development to do, there were bound to be bumps in the road along the way. With Vegas 15, the first build had issues but by the time of the last build, it was a very stable and reliable program. I have edited hundreds of hours of video with Vegas and rarely does it crash or freeze. I have honestly had more problems with Resolve and Premiere crashing on me than Vegas.
I don't think you will be able to find a more intuitive and stable program than Vegas Pro. I love it and recommend it. I'm sorry people are having issues with it, but they can only offer their experience the same as I can offer mine, and mine has been unquestionably good. I am glad Magix took over the program and keeps adding new features to it.
The last build of V15 is very stable. If someone is saying it isn't, it is more than likely an issue with that person's system. For example, they don't have the most recent graphics driver installed or there something going on with the source files. The truth is there are so many things it could be, it is easy to blame the software. And if it is the software, then the bug should be reported to Magix so they can fix it.