Honestly, the amount of patches and the frequency isn't the issue. It's 2 things.
1. They quit patching shortly after the GOTY release is out. Whatever comes with the new characters released then, or with the older characters that never got fixed, we have to deal with forever.
2. What they're patching. A lot of the changes in the patches from Injustice onward tended to be bugfixes, which is fine. Sometimes it hurt characters because players were developing strats around the bugs, but most of the time, they were just doing general clean-up. There were some actual changes, but not really too many. The issue, though, is that they get to the big patches, and don't address actual problems at times in balancing, and make some uneducated changes. Which sucks.